After being drafted O'Sullivan chose to play in the college ranks and played with the Boston University Terriers for 4 years. O'Sullivan missed the majority of his freshman year (1992–1993) after suffering a neck injury during a game versus Boston College.
After being selected O'Sullivan opted to participate in collegiate athletics and played with the Boston University Terriers for 4 years. O'Sullivan missed a significant portion of his freshman year (1992–1993) after sustaining an injury to his neck during a game against Boston College.