Dr. Sheehan attended St. John's University where he earned a Bachelor of Science degree in Biology in 1981. After completing his D.M.D. at Fairleigh Dickinson in 1985, Dr. Sheehan completed his residency at Long Island Jewish Medical Center, where he is currently an attending.  Dr. Sheehan has been the Chief of the Division of Dentistry and Oral Surgery at St. Francis Hospital for over twenty years.  He has been in practice at both the St. Francis and Northern Boulevard locations since 1986.  He is a member of the American Dental Association, New York State Dental Association, Nassau County Dental Society, and the Staff Societies of St. Francis Hospital and Long Island Jewish Medical Center.  He resides in Port Washington with his wife, and four daughters.