Date of birth (location)
19 August 1955
Armonk, New York, USA
5′ 10″ (1.78 m)
Paula Harwood (1983 – present) 2 children
His thick eyebrows
Starred as Sky Masterson in the 1992 Broadway revival of the musical Guys and Dolls. It also starred Nathan Lane.
Attended Tufts University. He sang in a group called the Beelzebubs, which is a „mini rock choir“ (a capella group) at Tufts. [1973-1977]
Was a considered for the role of Ethan in „Supergirl (1984)“
Attended Byram Hills High School in Armonk, New York
Sandy Cohen, Gallagher’s character on „The O.C.“ (2003), was ranked #25 in TV Guide’s list of the „50 Greatest TV Dads of All Time“ [20 June 2004 issue].
Is an avid golfer.
Attended the Best In Drag Show in Los Angeles which raised $150,000 for AIDS afflicted. The show’s Producer/Director was Tom Perdoe. 
Despite having the same last name, all being musically talented, and all having the trademark „Gallagher eyebrows,“ he is not related to Liam or Noel Gallagher from British rock-group Oasis.
Was nominated for Brodway’s 1986 Tony Award as Best Actor (Featured Role – Play) for a revival of Eugene O’Neill’s „Long Day’s Journey into Night.“