 
 
By Bud Webster
 
 
A Logic Named Clement (or Open the Pod Bay Doors, Hal)
 His work has from the first been characterized by the complexity
and compelling interest of the scientific (or at any rate scientifically
literate) ideas which dominate each story. —John Clute,
writing in The Encyclopedia of Science Fiction (St. Martin's
1993) That's Hal Clement, all right. Even when I was a kid, we knew when we picked 
up a new Clement story or book that we were going to be challenged—those of us 
who weren't already science geeks, anyway. Not that he was utterly abstruse, mind you. You had to know your stuff, or at 
least have access to a science teacher who didn't mind answering questions about 
"sci fi," but there was plenty of story in there to be had, even if the ideas 
were most important. Several years ago, I was asked by a friend to speak to a group of 
middle-school faans who had decided to form a science fiction club at their 
school. I found them curious, enthusiastic, and eager to have anything new to 
read after finishing the most recent Harry Potter book. I read my own stories to 
them (set in their home town, which is the reason I was approached in the first 
place), answered their questions, and at the end, presented them with two 
grocery bags filled with old classic sf paperbacks: old Groff Conklin 
anthologies I had duplicates of, Asimov, Bradbury and Laumer collections, a few 
volumes of the Del Rey Best of . . . 
series, and whatever else I had around the house I thought they'd like (and 
wouldn't get them in trouble with their folks). I still hear from some of them once in a while, and by far the author many of 
them are most grateful for having been introduced to is Hal Clement. Which is as 
it should have been; these were good, smart and clever kids, ready to delve into 
the ideas and concepts that Clement, a teacher himself, was keen to impart. It 
was a match made, well, if not in heaven then certainly above the plane of the 
ecliptic. "Look," he 
explained it all to me once. "A writer is a man who makes his living writing. I 
make my living teaching. So I'm not a writer." —Lester del Rey, quoting 
the author in his introduction to The Best of 
Hal Clement (del Rey 1979) That's a characteristically low-key self-appraisal, of course, and one could 
debate it all day, but why argue with the man? He knew his priorities, and his 
students and scouts came before publishers and editors with their eye-shades and 
cheap cigars. This is not to say that he didn't have a handle on how good he 
really was as a writer, however, as editor and publisher (sans shades and 
cigars) Warren Lapine recalls: The most 
interesting thing I ever heard him say about his own writing was (and I'm 
paraphrasing here) that he (Harry) had an ego every bit as big as Isaac's 
(Asimov) and that he (Harry) was as good a writer as Isaac, but that Isaac had a 
much better press agent. Harry Clement Stubbs was born in Somervile, Massachusetts on May 30, 1922. He 
got his B. S. in Astronomy from Harvard(!) when he was 21(!!), and four years 
later got his Masters in Education from Boston U. He also did grad work in 
chemistry. During WWII, he co-piloted B-24s for the Army Air Force, flying 33 combat 
missions in the ETO with the 8th. In the early 1950s he was recalled as a tech 
instructor at the special weapons school at Sandia. He taught science[i] at the Milton Academy in Cambridge, Mass. until his 
retirement, and if that wasn't enough, he was an avid scoutmaster the whole 
time. In his spare time, he was the epitome of the hard-science sf writer, the one 
that all sf fans pointed to when asked who paid the most stringent attention to 
the laws of physics when writing about aliens, humans and other planets. In his spare time, I repeat. He did it better 
than anybody else at the time (and for a long time after), he was a telling and 
righteous influence on Sheffield, Asaro, Benford, and all the other hard-science 
writers who came after him, and he did all that when he wasn't teaching kids astronomy or chemistry or 
how to tie knots. Do this for me. Look all the way down at the bottom of this article at the 
bibliography. Go ahead, I'll wait here and finish my root beer. Did you notice something? I sure as hell did: as influential as Hal Clement 
was, as important as he was as a yarn-spinner, as much as his name was bandied 
about for, oh, five decades or so as one of the giants, he built it all on the 
basis of a little over fifty stories and about a dozen books. In his spare time. Doesn't that just suck? No, it doesn't. It is, in fact, remarkable as hell. He was a remarkable 
individual, was Harry Clement Stubbs, and his work bears that out. He didn't 
cheat, he didn't fudge the numbers, and he didn't keep his eyes closed when he 
speculated. That wasn't what Clement was about, not at all. He was about making 
the story fit the science, not the other way around. Science was a suit he put 
on, it's what he was, and if the story 
had to work around the physics, it didn't work at all. Oh, he got it wrong once 
in a rare while, but when he did, you can bet that every pro in a labcoat had it 
wrong at the time, too. Nonetheless, science was never the trimmings in a 
Clement story, it was the whole turkey. He sold his first story to—as should surprise none of you reading this—John 
Campbell's Astounding. "Proof" appeared 
in the June, 1942 issue, and if it didn't quite raise a fuss, it was the camel's 
nose, and Astounding was the tent. How 
could Campbell have possibly resisted a story featuring aliens who lived inside 
a star: They had evolved 
far down near the solar core, where pressures and temperatures were such that 
matter existed in the "collapsed" state characteristic of the entire mass of 
white dwarf stars. . . . The race had evolved to the point where no material 
appendages were needed. Projected beams and fields of force were their limbs, 
powered by the annihilation of some of their own neutron substance. Hal Clement's 
second story, "Impediment," was a carefully thought out account of the landing 
of a space ship near the Arctic 
Circle and its discovery by one man. . . 
. The story was interesting on an intellectual level, as are all Clement's later 
works, but cold emotionally. —Alva Rogers, in A Requiem for Astounding (Advent 1964) Therein lies the focus of much of the criticism of Clement's writing, from 
the beginning right up until the end. Clement had the reputation for being the 
Mr. Spock of (real) science fiction, eschewing sentiment and emotions and 
stressing ideas over character. Well, yeah, but science is all about ideas, is 
it not? It's when you bring people into the mix that science gets all screwed up 
and messy and before you know it there are giant flying robots knocking off 
banks and cackling madmen in lab coats firing funny-colored rays at World 
Capitols and making Superman choose between London and Lois Lane. Right? Okay, I'm exaggerating for effect. Clement's characters are perfectly 
acceptable as characters; just don't expect them to cry or rave or even laugh 
more than is necessary to get the point across. In his world, characters exist 
to serve the idea, not the other way around. Damon Knight noted this in his 
examination of Clement's best (and best-known) story, Mission of Gravity: [Clement's] 
failings are a certain emotional blandness—no Clement character ever gets 
excited—and a low romantic quotient: where [Raymond] Gallun's monsters are alien and humanly sympathetic at 
the same time . . . Clement's often fail to convince simply because they're too 
human: more so, in fact, than some of the human characters. 
 Nevertheless, Knight doesn't stint his praise for the book, calling it ". . . the most back-breaking job of research ever 
undertaken to buttress a science fiction story. Moreover," he continues, 
"the result is worth the trouble." And 
boy-howdy, is it ever. This is the one book that is invariably mentioned 
whenever fans get together with other fans and talk about hard sf. When articles 
on the topic are written, or panels/workshops on hard science fiction are 
conducted by faans and pros alike, Mission of 
Gravity is the one title that is either praised or castigated as the 
ultimate case in point. Allow me to elaborate on that Rogers quote above, if you will. As I write 
this, Mary (my harshest critic and Boon Companion, Feeder of Cats and Painter on 
Fabrics) has read over the first draft of this little piece and has admonished 
me for my apparent dispassion towards my Subject. As is usually the case, she is 
correct, but don't tell her I said that or I'll never hear the end of it, 
okay? But she's right, I'm not terribly passionate about Clement's work, for all 
that I've read it over and over throughout the years and eagerly grabbed stories 
and books I didn't already have for my personal library. There's a reason for 
this. Let me be absolutely clear about it: Hal Clement is not a writer who engages 
the emotions. To the contrary, Clement's work appeals almost entirely to the 
intellect. Is this a bad thing? I think not, for many good reasons, but here's 
the best—Wonder is as much an object of the mind as it is the heart, perhaps 
more so. I'm not talking about the wonder of a rainbow here, but the Wonder of 
what makes that rainbow appear where before there was none. There are plenty of very fine writers who address the emotions, in one way or 
another or to one degree or another. Harlan Ellison, Zenna Henderson, Edgar 
Pangborn, and Barry Malzberg are only a bare few whose works tweak, tap or tear 
at the heart. They excel at it, and their work is effective and affecting. Hal Clement didn't play that. His interest was not in pulling strings or 
pushing buttons (well, not emotional ones anyway) but in taking hold of the mind 
and shaking it until that mind is a quivering lump of Wow! To that end, he created worlds and 
people—human and otherwise—who exemplify the very best of science fiction, 
accent on the first word. This is not an easy thing to do. I'm no scientist, I can tell you that: when I write a story that
includes a specific bit of physics or chemistry or astronomy, I get out
my phone list or e-mail address book and start asking those who know
better than I. I am in awe of those who don't need to do that, and trust
me, Harry Clement Stubbs was awesome. He had his speculative
ducks in a row before he ever put paper in his typewriter, and it really
does show.  Mesklin, the planet on which Mission of Gravity takes place,
is the original Discworld.[ii] During
its formation, it spun so fast that the sphere flattened, and as a
result, gravity is just all outta whack; a gentle three times
Earth normal at the equator, but a he-man challenging 700g at the
poles. Talk about needing orthotics. Clement figured out all the accessories for a planet like this, from weather 
patterns to how life would have evolved (intelligent centipedes), and I can tell 
you for certain that he enjoyed every single minute of it. Believe me, there are 
those of us for whom research is an evening's entertainment, whether its 
figuring out the biota of an alien planet or studying up on those who do. It is a wonderful book, and by that I mean one filled with wonder, not just a 
terrific read. A landmark in the field, its impact on those who read it and 
loved it stretches far beyond the bookstore or library shelves and further on 
into aerospace technology and even NASA. In a way, it really does represent 
science fiction just the way the Know-Nothings think it does when they point at 
it. They're right, of course, but for all the wrong reasons. Campbell, let's face it, had all kinds of ideas for his own stories, and 
until he took over the reins of Astounding back in 1937 he did pretty well 
with them. Being an editor, unfortunately, means that your own career as a 
writer has to suffer to one degree or another, and Campbell's screeched almost 
to a halt; he published little fiction after taking over the Astounding post, and that in other 
magazines. But there were all these ideas he had, see, and if he couldn't write 'em he 
sure as hell didn't see why somebody else couldn't. So, he would frequently toss 
an outrageous question or comment to one of "his" writers, and they quickly 
learned that he loved to be proven wrong, especially in his own magazine[iii]. Ergo, Needle. In a letter to the 
author dated April 12, 1953[iv], Campbell said, "Once 
upon a time I told you 'Science Fiction detective stories don't work—you can't 
write a good one.' So you proved that I was wrong in that, and wrote Needle." High praise, nicht wahr? Of course, 
even higher praise followed in the form of checks from every editor he submitted 
to (in his spare time), so that even if he still listed "educator" on his QV, 
his hobby was plenty lucrative. As an educator, kids were important to Clement. It shows in his writing: the 
protagonist of his first novel, Needle, 
is a teen-aged boy working with an alien symbiote detective to track down 
another symbiote, wherever on Earth it is, hence, a needle in an Earthstack; 
Close to Critical offers an Earthican 
robot on a heavy-gravity planet called Tenebra raising native children 
Earthishly, and his rescue of human children who have crashed there. Don't think 
that these are kids' stories, although kids can certainly enjoy them. Like 
another educator/writer, Zenna Henderson, Clement was writing about children, not down to them. They were 
important in his life, ergo they were present in his fiction. A significant percentage of his short fiction has been anthologized and/or 
collected over the years, seven stories alone between 1951 and '54. One of 
these, "Critical Factor," was commissioned by Frederik Pohl for his Star Science Fiction original anthologies and 
appeared in the second volume of that inestimable series in 1953. This was not 
the last time Clement would contribute an original story to an anthology, 
either. Twenty-three years later he would give Judy-Lynn del Rey "Stuck With It" 
for the second volume of her inestimable 
series, Stellar. Both stories bear the clear and unmistakable imprint of our beloved science 
teacher, for all that they don't bear resemblances to each other elsewise. Each 
has a primary concept used as a pivotal element around which Clement weaves his 
story, and both show the author's keen talent at presenting, and then (cleverly) 
solving, a problem based on that concept. Sounds cold and rigid, don't it? Well, it isn't. Clement might have
been all about the science, but he was also all about the story. Anybody
can take an idea and hang words on it with a beginning, middle and end[v] and call it a "story," but it takes a real
storyteller to do it right. Clement worked well with others on a social level, but only collaborated once 
in his career. In 1956, the magazine Satellite appeared with the promise of ". . . 
a complete science fiction novel in every issue," much as Startling had done a decade and change before. 
Sam Merwin, Jr., edited the first two (digest) issues, then left. Before he did, 
however, he added some 10k words to a story Clement wrote entirely from an alien 
viewpoint by inserting alternating chapters from a human perspective. It was 
published in the February, 1957 issue as "Planet for Plunder." As sf historian 
and critic Mike Ashley writes in his utterly necessary Transformations: Vol. 2, History of the Science 
Fiction Magazine, 1950–70 (Liverpool University Press 2005): Clement was asked 
if he could pad the story out to novel length. Clement had neither the time nor 
the desire to do so but, with his agreement, the story was revised. . . . It was 
never published in book form in this version, but the original novella, 
"Planetfall," was eventually printed in Robert Hoskins' anthology Strange Tomorrows in 1972. Ashley doesn't hesitate to cast a critical eye over the unfortunate result of 
this "collaboration," either, saying it ". . . 
added nothing new to the story and virtually killed it for the way Clement had 
planned and plotted it. In fact it's an object lesson in how to ruin a good 
story." In the last years of his life, Clement suffered from diabetes. I recall a 
panel at a local convention[vi] in 2002 at which he sat to be interviewed by another 
writer/historian, Paul Dellinger, and myself. At one point, as the afternoon 
went on, Clement began repeating himself, slurring his words and 
misunderstanding questions. He caught our expressions, reached into his pocket 
and unfolded a bag of plain M&Ms. Carefully counting out a precise number of 
the little candies, he popped them into his mouth and chewed. Within moments, he 
was sharp again, energetic and right on top of us. It was a typically Clementian thing to do, of course. He could never stand 
being fuzzy or confused, either in his writing or his daily life, and his 
interface with the world had to be just so. That he was "medicating" himself 
with candy-coated chocolate that melts in your mouth (not in your hand) instead 
of prescription drugs was just another clue to his meticulous approach to 
everything, fiction included. Why spend money on pills you can barely pronounce 
when you can get the same effect from shopping at any 7-11 candy aisle? "Meticulous," he says. . . . Paul and I asked him a number of 
process-oriented questions that afternoon, and he remembers a comment Clement 
made which clearly exemplifies his habitual pains-taking, one I had since 
forgotten: He did stories by 
writing scenes on index cards, and only when he had sufficient numbers of those 
would he begin actually writing the story. Between 1994 and 1999, he wrote six stories for the DNA magazine Harsh Mistress (later Absolute Magnitude). HM/AM 
was, for the duration of its publication, a periodical that bubbled just under 
the level of its principal competitors, each issue threatening to burst through 
the floor and out-sell the older and more established markets. So, how did it 
rate an almost regular appearance by one of the Major League Hall of Famers? 
Editor and publisher Warren Lapine met Clement at Not Just Another Con in 1993, 
found him to be (as usual) very approachable, and, er, approached him: At that point our 
first issue wasn't even out, but I asked him if we could get a story from him. 
He gave a noncommittal answer and I figured that was that. A few months later I 
was at another convention. . . . I was literally telling a new would-be writer 
that he could not just hand me a manuscript at a con and expect me to consider 
it when Harry walked up to me and said, "Here's the story you asked for," and 
handed it to me on a five-inch floppy. I, of course, said "Thank you!" and then 
amended what I had been saying to the new writer to, "You can't hand me a 
manuscript at a con and expect me to consider it unless you're Hal Clement. . . 
." That story was "Sortie," and it appeared sixteen years after his previous one. Why so 
long? Well, first of all, it wasn't as if Clement didn't have other things to 
do; recall, if you will, that his career as an author was pursued in his spare 
time. Lapine asked him why he'd stopped, and ". 
. . he told me it was because people had stopped asking him for stories." 
Unwilling to let that one go, and because "Sortie" was deliberately unresolved, 
Lapine urged him to write a sequel to tie up loose ends. Clement replied that he 
could do that, but that it might take three or four stories. "I was okay with that," Lapine says, "I told him 'Of course' and he wrote three more 
stories that ended up as the novel Half 
Life." Harry Clement Stubbs left us on October 29th, 2003, at the age of 
eighty-three. He went quietly in his sleep, and perhaps he's somewhere still 
dreaming, file cards in hand and papers to be corrected stacked neatly by his 
elbow. The body of work he left behind isn't as extensive as many, but it's as 
rich and intricate as any. He left a large footprint on the Terra, and unlike 
all too many of his colleagues, his stories read as well now as they ever did. 
Warren Lapine praises him highly, saying "Harry 
was the nicest and easiest person I've ever worked with. I can't remember a 
single tense moment with him . . . I don't think he ever said an unkind word 
about anyone." He was a fascinating man to talk to, filled with stories and facts, and above 
all, Ideas. His absence leaves a void 
that can never be filled by another.  (As usual, this bibliography is as complete 
as I can make it given my resources, and is limited to first publications except 
where the same story was published under two or more titles. Also as usual, I 
welcome all corrections and additions; c'mon, folks, keep me honest.) Of course, this endeared him to John
Campbell and the readers of Astounding/Analog (where most of his
stories appeared) for years, but he never had trouble finding an
audience wherever he went.
Of course, this endeared him to John
Campbell and the readers of Astounding/Analog (where most of his
stories appeared) for years, but he never had trouble finding an
audience wherever he went. 
 O, 
my little droogies, your faithful narrator would love to have been a fly on the 
wall of the Street and Smith offices that afternoon. Of his fifty-plus stories, no 
fewer than twenty appeared in Astounding/Analog, with his last story gracing 
the pages of the January 2000 issue. That's a span of 58 years, a record few can 
even come close to.
O, 
my little droogies, your faithful narrator would love to have been a fly on the 
wall of the Street and Smith offices that afternoon. Of his fifty-plus stories, no 
fewer than twenty appeared in Astounding/Analog, with his last story gracing 
the pages of the January 2000 issue. That's a span of 58 years, a record few can 
even come close to.
 Mission 
wasn't his first book, though. Before that came Needle and Iceworld. The former came about as a result of 
a statement John Campbell made to Clement in hopes that the author would do just 
what he did: write a story to prove him wrong.
Mission 
wasn't his first book, though. Before that came Needle and Iceworld. The former came about as a result of 
a statement John Campbell made to Clement in hopes that the author would do just 
what he did: write a story to prove him wrong.
Bibliography of Hal Clement
Short Stories
"Proof"—June 1942 Astounding
"Impediment"—August 1942 Astounding
"Probability Zero: Avenue of Escape"—November 1942 Astounding
"Attitude"—September 1943 Astounding
"Technical Error"—January 1944 Astounding
"Trojan Fall"—June 1944 Astounding
"Uncommon Sense"—September 1945 Astounding [Laird Cunningham] 
"Cold Front"—July 1946 Astounding
"Assumption Unjustified"—October 1946 Astounding
"Answer"—April 1947 Astounding
"Fireproof"—March 1949 Astounding
"Needle"—serial, May, June 1949 Astounding [Robert Kinnaird] 
"Iceworld"—October-December 1951 Astounding
"Halo"—October 1952 Galaxy
"Critical Factor"—in Star Science Fiction 
Stories No. 2, ed. Frederik Pohl, Ballantine 55, 1953
"Mission of Gravity"—serial, April-July 1953 Astounding [Mesklin] 
"Ground"—December 1953 Science Fiction 
Adventures
"Dust Rag"—September 1956 Astounding
"Planet for Plunder"—February 1957 Satellite (with Sam Merwin, Jr.)
"Close to Critical"—serial, May-July 1958 Astounding [Easy Rich] 
"The Lunar Lichen"—February 1960 Future
"Sunspot"—November 1960 Analog
"The Green World"—May 1963 If
"Hot Planet"—August 1963 Galaxy
"Raindrop"—May 1965 If
"The Foundling Stars"—August 1966 If
"The Mechanic"—September 1966 Analog
"Ocean on Top"—serial, October-December 1967 If
"Bulge"—September 1968 If
"Star Light"—serial, June-September 1970 Analog [Mesklin; Easy Rich] 
"Lecture Demonstration"—in Astounding: John 
W. Campbell Memorial Anthology, ed. Harry Harrison, Random House 1973
"The Logical Life"—in Stellar 1, ed. 
Judy-Lynn del Rey, Ballantine
"Mistaken for Granted"—January/February 1974 Worlds of If
"Longline"—in Faster Than Light, ed. 
George Zebrowski and Jack Dann, Harper & Row 1976
"A Question of Guilt"—in The Year's Best 
Horror Stories IV, ed. Gerald W. Page, DAW 1976
"Stuck With It"—in Stellar 2, ed. 
Judy-Lynn del Rey, Ballantine 1976
"Seasoning"—September/October 1978 Asimov's 
[Medea] 
"Sortie"—Spring/Summer 1994 Harsh 
Mistress
"Settlement"—Fall/Winter 1994 Absolute 
Magnitude
"Seismic Sidetrack"—Spring 1995 Absolute 
Magnitude
"Simile"—Summer 1995 Absolute 
Magnitude
"Oh, Natural"—Spring 1998 Absolute 
Magnitude
"Exchange Rate"—Winter 1999 Absolute 
Magnitude
"Under"—January 2000 Analog [Mesklin] 
"Whirligig World"—June 1953 Astounding
"Gravity Insufficient"—November 1961 Analog
"Atoms and Opinions"—Galileo #2 1976 
"Introduction to 'Proof'"—Spring 1977 Unearth 
"Science"—(column) Winter 1977—Winter 1979 Unearth
"Red World 2"—Galileo #11 1979 
"On the Tenth of Apollo 11"—July 1979 Galileo
"Voyager 2"—November 1979 Galileo
"Pretty Pictures"—Event Horizon #2 
1980 
"The Home System"—October 1986 Aboriginal 
SF
"Essay: Whatever Happened to the Science in Science Fiction?"—September 1993 
Science Fiction Age 
"Only Once"—Spring 1994 Fractal
"Ardent Thuria, Chilly Cluros: Seeing, and Seeing From, Low Orbiting 
Satellites" —Fall 1994 Mindsparks
Needle—Doubleday 1950; also as From Outer Space, Avon T175, 1957
Iceworld—Gnome Press 1953; Lancer 
75-128, 1967
Mission of Gravity—Doubleday 1954; Galaxy Novel 33, 
1958; Pyramid F786, 1962
Ranger Boys in Space—Page 1956 
(YA)
Cycle of Fire—Ballantine (hc), 200 
(pb), 1957 (simultaneous publication)
Close to Critical—Ballantine U2215, 
1964
Natives of Space—Ballantine U2235, 
1965 (collects three novellas)
Small Changes—Doubleday 1969; also as 
Space Lash, Dell 8039, 1969
Star Light—Ballantine BB 2361, 
1971
Ocean On Top—DAW 57, 1973
Through the Eye of a 
Needle—Ballantine 25850, 1978
The Best of Hal Clement—Del Rey 
27689, 1979
The Nitrogen Fix—Ace 1980
Intuit—NESFA Press 1987 (for Boskone, 
limited to 820 copies)
Still River—Del Rey 1987
Half Life—Tor 1999
The Essential Hal Clement, Vol. 1: Trio for 
Sliderule and Typewriter—NESFA Press 1999
The Essential Hal Clement, Vol. 2: Music of 
Many Spheres—NESFA Press 2000
The Essential Hal Clement, Vol. 3: 
Variations On a Theme By Sir Isaac Newton—NESFA Press 2000
Heavy Planet—Tor 2002 (Mesklin)
Noise—Tor 2003
First Flights to the Moon—Doubleday 
1970
(Note: The Encyclopedia of Science 
Fiction [compiled by John Clute and Peter Nichols, St. Martin's 1993] 
indicates that this is a non-fiction anthology, but it is all fiction.)
[i] Can you imagine your science teacher writing science fiction? How cool is that? I don't know about you, cowboy, but I'd have been over the moon about it. Nyuk-nyuk.
[ii] I honestly have no idea if Sir Terry Pratchett had read Mission before he wrote Strata, his first novel about a flat planet (and unconnected with the Discworld books), but he may very well have done.
[iii] Except about psionics, Dianetics, and the Dean Drive. He got really cranky about those.
[iv] This is the same year that Asimov's response to that statement, The Caves of Steel, was published. In another magazine. Hey, Campbell didn't always get his way.
[v] Urk. Considering some of the workshops I've been in over the years, perhaps that statement is a bit of a stretch.
[vi] SheVaCon, held in Roanoke, Virginia. Clement was a frequent guest.