Hardball NY co-founder Bill Sullivan served as the Head Baseball Coach at NCAA Division II Mercy College for 15 years. During his tenure he coached several All-Conference honorees, including Japan League and former Major League pitcher Brian Sweeney.

Sullivan began his coaching career after playing for legendary skipper and mentor Gene McDonald at La Salle, a NCAA Division I program. He first served as an assistant coach for three years at Mercy College under Timmy Kelly, before taking the helm for the 1994-95 campaign.

Sullivan's baseball background reaches beyond the collegiate level as he has also directed and instructed at numerous youth camps and clinics, including Triple Play Baseball Academy, Cooperstown Diamond National Youth Baseball Academy, University of Miami, Barry University, and Mercy College. During his career he has instructed hundreds of aspiring young athletes, with many alumni going on to collegiate careers.

Sullivan was a three-sport athlete at Clarkstown North, participating in baseball, football, and basketball. During his final year he was selected to play in the Exceptional Seniors Game. He began his own collegiate career at Nichols College, where he posted a 5-3 record as a starting pitcher during his freshman season under coach Al Makasion. Sullivan transferred to La Salle, playing three years under McDonald. He pitched and played the infield during his career with the Explorers.

Sullivan also carries a strong educational background, serving as a teacher for a combined 12 years at Preston High School and Clarkstown North High School. Prior to that he played for three years at Division I La Salle University where he pitched and played the infield.

Sullivan is a 1991 graduate of La Salle, earning a bachelors degree in secondary education.