Fink arrived at USJ in 2018, utilizing his coaching and fitness background among a variety of roles, including serving as interim head women's lacrosse coach in the spring 2019, and the head men's and women's cross country coach, beginning in the fall of 2019.

Fink spent the previous 16 seasons at Mount Ida College, where he was the head men's lacrosse coach for 15 of those 16. He has compiled an overall lacrosse head coaching record of 171-91 (See year-by-year below), and currently holds the record for most wins as a head coach in the Great Northeast Athletic Conference (GNAC) with 54.

While at Mount Ida, Fink led the Mustangs to eight conference championships, including an astounding six in a row in the North Atlantic Conference (NAC), and back-to-back in the GNAC. His teams made four trips to the NCAA Division III Men's Lacrosse tournament in 2007, 2008, 2011 and 2012. He is a three-time Coach of the Year, earning the honor as NAC Coach of the Year in 2004 and 2010, and as the GNAC Coach of the Year in 2011. Fink was also dubbed Mount Ida College's Coach of the Year three times (2009, 2011, 2015).

In 2017, Fink led Mount Ida to a 14-5 record, including an eight-game winning streak, and helped them reach the GNAC championship game for the fifth time in seven years since joining the league. That game also marked the eleventh season in which Fink and the Mustangs appeared in their conference title game, as they made seven appearances in the NAC championship, winning six straight conference titles from 2004 and 2009. His 2007 NAC championship team, which earned the first NCAA tournament bid in program history, was inducted into the Mount Ida College Athletics Hall of Fame in 2014.

While members of the NAC, Fink compiled a regular season conference record of 56-1, and began a streak of eight seasons with double-digit victories, including a program-record 15 wins in 2012, repeating as GNAC champs in just their second year in the conference.

Fink and his coaching staff will be presenting for an unprecedented 11th time at the U.S. Lacrosse National Convention in Philadelphia in 2020. Previous topics included, "Offense vs. Defense - Strategy and Adjustments", "Team Defense", "Man-Down Defense", "Wing Offense", and "Defensive Sets", and "Team Defense Playing Angles and Throwing Quality Checks".