An email list discussion got me curious about how many former Worldcon chairmen were still living (since I'd never met the chairs of Clevention, held in my home town when I was 2). This is the list I came up with, but there are some I'm not sure of. I did this based on my own limited information by looking at the Long List. Are there people here who shouldn't be, and who are deceased? And have I missed people who I just don't know, but who are still around and kicking?
Note that names in italics are the ones added in as a result of comments.
Julian C. May (TASFiC, 1952) David Kyle (NyConII, 1956) Roger Sims (Detention, 1959) Fred Prophet (Detention, 1959) George Scithers (Discon I, 1963) Ted White (Nycon 3, 1967) Tony Lewis (Noreascon I, 1971) Chuck Crayne (L.A.Con I, 1972) Ron Bounds (Discon II, 1974) Robin Johnson (Aussiecon I, 1975) Ken Keller (MidAmericon, 1976) Tim Kyger (IguanaCon II, 1978) Pete Weston (Seacon '79, 1979) Leslie Turek (Noreascon II, 1980) Suzanne Carnival [now Carnival-Reece] (Denvention Two, 1982) Mike Walsh (ConStellation, 1983) Craig Miller (L.A.Con II, 1984) Milt Stevens (L.A.Con II, 1984) David Grigg (Aussiecon Two, 1985) Penny Frierson (ConFederation, 1986) Paul Oldroyd (Conspiracy '87, 1987) John Guidry (Nolacon II, 1988) Mark Olson (Noreascon III, 1989) Kees van Toorn (ConFiction, 1990) Kathleen Meyer (Chicon V, 1991) Joe Siclari (MagiCon, 1992) David Clark (ConFrancisco, 1993) John Mansfield (ConAdian, 1994) Vince Docherty (Interthingies I and II, 1995 & 2005) Martin Easterbrook (Interthingy I, 1995) Mike Glyer (L.A.con III, 1996) Karen Meschke (LoneStarCon 2, 1997) Peggy Rae [Pavlat] Sapienza (BucConeer, 1998) Perry Middlemiss (Aussiecon Three, 1999) Tom Veal (Chicon 2000, 2000) Todd Dashoff (Millennium Philcon, 2001) Tom Whitmore (ConJosieAndThePussycats, 2002) Kevin Standlee (ConJosieAndEtc., 2002) Peter Jarvis (Torcon 3, 2003) Colin Harris (Interthingy II, 2005) Christian McGuire (LACon IV, 2006) Hiroaki Inoue (Nippon2007, 2007) Kent Bloom (Denvention 3, 2008) René Walling (Anticipation, 2009) Robbie Bourget (Anticipation, 2009)