Geoffrey Michael "Geoff" Pierson (born 16 June 1949) is an American actor.
He starred in the TV comedies Unhappily Ever After (WB) as Jack Malloy and as Jimmy Kelly in Grace Under Fire (ABC Network). He is also known for his roles as President John Keeler on 24 (FOX) and as Frank Ryan on the ABC daytime serial Ryan's Hope. He has guest-starred in dozens of other TV shows.
Pierson was born in Chicago, Illinois, the second of seven children born to Roy, an entrepreneur (who founded Feralloy Corporation and, later, Pierson Steel), and Helen (née Maginess) Pierson, who wed on 29 October 1946 at St. Philip Neri Church in Chicago's South Shore. The family was Roman Catholic, and the siblings attended Catholic schools in Winnetka's Sacred Heart parish. After graduating from New Trier High School, Pierson went on to earn a B.A. at Fordham University and later an M.F.A from the Yale School of Drama.