Born in Charleston, South Carolina, Duffy received a Bachelor of Arts degree from The Citadel in 1965 and a Juris Doctor from the University of South Carolina Law Center in 1968.
He was a staff attorney of Neighborhood Legal Assistance Office from 1968 to 1969, and then served as a Military Police officer in the United States Army from 1969 to 1971.
On October 11, 1995, Duffy was nominated by President Bill Clinton to a seat on the United States District Court for the District of South Carolina vacated by Matthew J. Perry.
He took senior status on December 27, 2009 and was succeeded by Timothy M. Cain.
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