Dennis was a teacher in the Riverhead School District and a teacher in the Longwood School District as well as an assistant principal. Between his work in the two school districts, Dennis joined the Peace Corps and taught English as a Second Language for two years on the Islands of Saipan and Pagan. He was also the Administrator for the Mariana Islands’ Head Start Summer School for the Islands of Rota, Tinian and Saipan. Dennis is married to Kathleen, and they have two sons and three grandchildren. After he retired, Dennis joined the Port Jefferson Rotary and now has the honor of being a member of the Camp Pa-Qua-Tuck Board of Directors.