Sean O'Brien enters his second season as an assistant coach for the Endicott baseball program.

O'Brien came to Endicott after spending the last two years as an assistant with his alma matter Franklin Pierce University. While there, Sean was responsible for working with the catchers and hitters, and was also the head coach of the Junior Varsity squad. 

Before rejoining Franklin Pierce, Sean was also an assistant at the University of Massachusetts-Lowell and coached several amateur travel teams . Sean also coaches during the summer in the Cape Cod League, going on his third year with the Brewster Whitecaps. 

Sean graduated from Franklin Pierce University in 2006. He spent four years behind the plate for the Ravens and captured a pair of NCAA Northeast Regional titles. Both teams finished as National Semi-Finalists at the Division II College World Series in 2003 and 2006. His 2003 team was inducted into the Franklin Pierce Athletics Hall of Fame.