Itzin has held recurring roles on popular TV series such as Friends as Theodore Hannigan, father of Mike Hannigan, Murder One, NCIS, and The Mentalist. He played the head of the unit in the latter for 13 episodes, before leaving to return to 24 for its final season.
Itzin has appeared in recurring roles on popular TV shows like Friends, Murder One, NCIS, and The Mentalist, playing Theodore Hannigan, father of Mike Hannigan. He was the head of the unit in The Mentalist for thirteen episodes before returning to 24 for its final season.