Ahearne grew up in Albuquerque but later moved to Playa del Rey, Los Angeles where he attended St. Bernard High School.

[2] Ahearne did not receive any NCAA Division I scholarship offers after high school and, as a result, enrolled at Los Angeles Harbor College.

[3] He was unanimously selected to the 1992 College Baseball All-America Team and was named the West Coast Conference Pitcher of the Year.

Between those stints in affiliated ball, he pitched in one game for the Duluth-Superior Dukes of the Northern League in 1996, giving up six runs in less than five innings.

[9] After playing in Taiwan, Ahearne represented the United States in a series of exhibitions against Italy and Spain's national teams in Europe.

[15] Ahearne was hired as the head coach of the varsity baseball team at Rye Country Day School beginning in 2018.