Gregory Martin Itzin was an American character actor of film and television best known for his role as U.S. President Charles Logan in the action thriller series 24.

Charles Logan is a fictional character played by Gregory Itzin in the television series 24. During the show's fourth season, Logan is the Vice President of the United States who is sworn into office as President of the United States when former President John Keeler is critically injured in a terrorist attack. Subsequently, Logan's administration fell into corruption. The show's fifth season sees him engage in a massive conspiracy to solidify United States oil interests. Logan appears in the fifth and eighth seasons as the primary antagonist.