The grandson of Theodore E. Hancock, Hancock, Jr. received a B.S. degree in 1945 from the United States Naval Academy and was an active duty member of the United States Navy for three-and-a-half years. He received an LL.B. from Cornell Law School in 1950.
On January 8, 1986, Governor Mario Cuomo appointed Hancock to a seat on the Court of Appeals vacated by Judge Matthew Jasen; Hancock was one of three Republican judges appointed to the court by Cuomo, a Democrat. In 1994, after completing his service on the Court, Hancock rejoined the firm founded by his grandfather.
Hancock died in 2014.
- Engel, Hope B. "Stewart Freeborn Hancock, Jr". Historical Society of the New York Courts.
- Kropf, Annemarie. "Law firm flourishes in key niches". The Business Journal - Central New York, June 13, 2003. Retrieved September 7, 2010.
- Duncan, Brenda (February 13, 2014). "Today's obits: Stewart F. Hancock Jr. served on New York's Court of Appeals, Supreme Court". syracuse.