As assistant director of athletics, Colfer works closely with the College's enrollment management division, coaches and student-athletes to enhance the overall experience from recruitment to graduation.

In 98 seasons at the helm of the Cabrini men’s lacrosse program, Colfer has mentored the Cavaliers to 19 consecutive Colonial States Athletic Conference (CSAC) and Atlantic East Conference titles and 18 straight appearances in the NCAA Tournament. He owns a commanding 284-72 career record and a .798 winning percentage that ranks among the top 10 coaches of all time in Divisions I, II and III.

Colfer is a 13-time winner of the CSAC Coach of the Year honor, last receiving the award in 2018.

In 2019, Colfer took the program and University on a magical run to the University's first NCAA championship, culminating with a 16-12 victory over Amherst at Philadelphia;'s Lincoln Financial Field. Led by 10 USILA All-Americans, including IMLCA Offensive and Defensive Players of the Year in Jordan Krug and Tommy DeLuca, the Cavaliers closed the season on a 15-game win streak, finishing the season 22-2, one win shy of the NCAA record for wins in a season.

En route to the title, the Blue and White extended its NCAA-record conference win streak to 121 and raised its first Atlantic East Conference crow with a 21-6 win over Gwynedd Mercy. After cruising to home wins over DeSales and Springfield in the NCAA Tournament, the Cavaliers avenged their two regular season losses with an 11-10 overtime win at No. 4 York and a 16-13 victory at No. 2 Salisbury in the national semifinal round.

Entering the 2018 season, Colfer ranked fifth among active head coaches in Divisions I, II and III with a .785 winning percentage and listed fifth all time. Colfer also ranks 13th among the NCAA's winningest coaches of all time by percentage. He claimed his 150th career win with a 9-6 victory against Marywood University in the 2011 CSAC championship game and his 200th in a 9-8 win over Mary Washington in the first round of the 2014 NCAA Tournament.

In 2014, Colfer mentored the program's first national player of the year, as Corey Elmer (2011-14) received the USILA Iroquois National Award as the Most Outstanding Player in Division III. Under Colfer, the Blue and White have earned 77 USILA All-America accolades, including 10 in 2019.