Gem Twist had an extensive show jumping career between 1985 and 1997 under three different international level riders: Greg Best (up to 1992), Leslie Howard (1992-1995), and Laura Chapot (1995 onward).
Greg Norman | Greg LeMond | Greg Louganis | Greg Chappell | Greg Nickels | Greg Bear | Greg Abbott | Greg Osby | Greg Dyke | Greg Kurstin | Greg Grunberg | Greg Lynn | Greg Mortenson | Greg Keelor | Greg Hopkins | Greg Behrendt | Greg Phillinganes | Greg Morrisett | Greg James | Greg Giraldo | Greg Egan | Greg Dulli | Greg Bahnsen | Red Eye w/Greg Gutfeld | Greg Shaw | Greg Schiano | Greg Rucka | Greg Raymer | Greg Kihn | Greg James (DJ) |
:Golfer Des Smyth also has a son, Greg, best known for winning the Irish lottery in 2008.