A two-sport All-American, Rosa was a standout in both lacrosse and football. A lacrosse midfielder, he was a first team USILA Division III All-American and the recipient of the USILA Iroquois Nationals Award (national player of the year) in 1986. A linebacker on the gridiron, he earned honorable mention All-America honors on the Division III Sports Information Directors teams in 1983 and 1985.