John Breen enters his sixth season as an assistant coach with the Endicott men's volleyball program in 2023-24. Breen will focus his efforts on the setters within the program.

A former NCAA Division I setter at Sacred Heart University, Breen still ranks fourth all-time in assists per set in a single-season (11.37, 2007) and fourth all-time in career assists (1,029, 2005-07). Breen also played at the University of Findlay from 2002-05.

Meanwhile, prior to coaching at Endicott, Breen served as an assistant coach with both the Emerson College men's and women's volleyball programs (2013-14), the Lasell College men's volleyball program (2011-13), and the North Shore Juniors club team (2000-15). He also served as the head coach of the Smash Volleyball Club in 2013.

Breen holds a Bachelor of Science degree in business administration from Sacred Heart and a JD from the Syracuse University College of Law. He currently serves as a financial advisor with Raymond James Financial Services/Boston Harbor Wealth Advisors and operates his own law office in addition to assisting at Endicott.