Horgan was born in
Newport, Rhode Island. He attended the
University of Rhode Island on a football scholarship before switching to golf. He turned professional in 1984. Horgan was a member of the PGA Tour from 1989–94 and 1997–2000 and was a member of the Nationwide Tour in 1991, 1994–96 and 2003-05. He won three events on the Nationwide Tour and his best finish on the Nationwide Tour money list was 7th in 1996 when he recorded nine top-10 finishes. He also won the
Rhode Island Open in 1994. Horgan was involved in one of the more unusual disqualifications seen in the
PGA Tour. He shot an opening round 71 in the 1998
Buick Open, but had forgotten to register for the tournament and was disqualified after the round. Horgan qualified for the 2012
Champions Tour after finishing fifth at
qualifying school. In May 2017, Horgan qualified for the 2017
U.S. Senior Open by carding a 71 at the Legacy Golf Club in Port St. Lucie. He was one of only two players under par for the sectional qualifier. ==Professional wins (10)==