Dr. Duffy completed undergraduate schooling in 1991 from Cornell University with a BA in Biology, graduating with Distinction in all Subjects. He was inducted into the Phi Beta Kappa honor society at the completion of his studies. He also commissioned as a Lieutenant in the U.S. Army. While serving in the Army Reserves, Dr. Duffy attended the University of Minnesota Veterinary School, graduating in 1995. Upon graduating, he then decided to go active duty and served both state side and overseas while working with military dogs until 1999. After returning to the US, Dr. Duffy practiced in Florida, and for the past 15+ years on Long Island. He and his family also make their home on the East End of Long Island.