Seamus Gregory was named interim head coach of the Forester men's hockey program during the summer of 2010. He spent the previous two seasons as the team's assistant coach, giving him seven years in the coaching profession.

In addition to serving as the Foresters' assistant varsity coach from 2008-10, Gregory was also the head junior varsity coach as well as the program's recruiting and video coordinator.

Gregory helped Lake Forest transition into the Midwest Collegiate Hockey Association prior to the 2009-10 season. The Foresters won their MCHA quarterfinal series to reach the Harris Cup Four in their first year in the league.

As Lake Forest's recruiting coordinator, Gregory was largely responsible for the 19 team members who were new to the program in 2009-10. Nine of those players ranked among the top 35 in the league in points by a freshman and defenseman Trent Brown was named to the MCHA's All-Freshmen Team.

Gregory spent the previous five years as the associate head coach of the St. Mary’s High School (Lynn, Massachusetts) boys varsity hockey team. St. Mary’s competes in the Division I Catholic Central League, one of the premier leagues in the state. He was also a history and psychology teacher at the school. Gregory was also actively involved with hockey camps and clinics throughout Massachusetts and holds a Level 4 USA Hockey Certificate.

A native of the small fishing community of Harbour Grace, Newfoundland, Canada, Gregory immigrated to the United States with his family in 2001. He grew up playing minor hockey for Harbour Grace's Conception Bay Ceebees, one of the more prestigious programs in Atlantic Canada. The Ceebees have produced many of Newfoundland's top players, including the province's first NHL player (Alex Faulkner) and first Stanley Cup winner (current Detroit Red Wing Daniel Cleary). Gregory is the first Newfoundlander to be the head coach of an NCAA Hockey Program.

Primarily a right wing, Gregory’s playing career included stints in 3 different provinces in Canada. He is an alumnus of the St. John’s, New Brunswick, and Maritime Junior Hockey Leagues.

Gregory graduated in 2003 from St. Thomas University in Fredericton, New Brunswick, Canada, where he majored in history and minored in sociology.