Judd Seymore Hirsch (born March 15, 1935) is an American actor. He is known for playing Alex Rieger on the television comedy series Taxi (1978–1983), John Lacey on the NBC series Dear John (1988–1992), and Alan Eppes on the CBS series Numb3rs (2005–2010). He is also well known for his career in theatre and for his roles in films such as Ordinary People (1980), Running on Empty (1988), Independence Day (1996), A Beautiful Mind (2001), Independence Day: Resurgence (2016), Uncut Gems (2019), and The Fabelmans (2022).