Rohan attended Columbia from 1949 to 1953, and was a member of the famous 1950/51 team under coach Lou Rossini that went undefeated through its regular season, winning all 22 of its games and capturing the Ivy League title with a 12–0 mark.
Rohan was selected national Coach of the Year for the 1967–68 season after leading Columbia to the Ivy League championship.
It was led by Jim McMillian and Dave Newmark, both of whom played professional basketball, and Heyward Dotson, an NBA and ABA draftee.
Rohan announced on February 18, 1974 his resignation as coach at season's end to become the tenured chair of the university's physical education department.
Rohan died on August 9, 2004, aged 72, in a nursing home in South Yarmouth, Massachusetts, of complications from Guillain–Barré syndrome.