Keefer played a large role in the Tigers' three-year Mason-Dixon Championship run from 1971 to 1973. As a freshman in 1971, he was a standout on the freshman team, and even saw action on the varsity squad. He got his first experience when he started in the 1971 Knute Rockne Bowl for the injured Mike Leidy. A three-year letterman, Keefer earned Second Team All-VCAA and Honorable Mention All-Mason-Dixon honors in 1973. He also led the team that year with three fumble recoveries. As a senior in 1974, he was a First Team All-VCAA, All-Mason Dixon honoree and Honorable Mention Little All-America. He also served as a tri-captain for his senior campaign. Keefer resides in Lynchburg, Virginia, and is the owner of Keefer Lumber Company.