Manny Rapkin joined the SNHU staff in the spring of 2022 as first assistant and Defensive Coordinator. In 2021 he served in the Patriot Lacrosse program working with the program goalies and the rising junior team. He spent the 2020 season at Vassar College as a defensive assistant working mainly with the defensive midfielders.

From 2012-19, Rapkin served as the head coach at Grand Canyon University, where he led the Antelopes to two Men's Collegiate Lacrosse Association (MCLA) national championships (2015 and 2017), as well as one national semifinal and two quarter final appearances. His players earned more than 30 MCLA postseason awards.

Prior to Grand Canyon, Rapkin coached Division II Dominican College to its best season in 2010, setting 14 school records including wins in a season and conference wins in a season, while shattering the school scoring record by 50 goals. He spent four years at Dominican, two as head coach.

Rapkin played college football and lacrosse at Division I Siena College and later earned a degree in Finance at the University of Miami Herbert Business School.