In 1985, Morrison became assistant dean in the undergraduate advising office of the College of Letters and Science. In 1994, Morrison retired from his professorial position but remained in his position as assistant dean until his death. During this time, he was a member of the UCB Special Scholarships Committee, part of the Academic Senate Committee and the university's Professional Development Program (led by Philip Treisman). At UC Berkeley, he was also a longtime member of the physics department's library committee.