Terrence Wallin was named the third head coach in Mariners history in July of 2022, following Ben Guite’s departure to Bowdoin College. Wallin became the Mariners Assistant Coach under Guite in 2021 after retiring from a five-year professional playing career, the final two as a Mariner. A native of Yardley, PA, Wallin has multiple New England connections, including a family home in Kennebunk. He also played his college hockey at the University of Massachusetts-Lowell from 2011-15. After beginning his pro career with the Southern Professional Hockey League’s Peoria Rivermen in 2015-16, he rose to the ECHL and the Adirondack Thunder. Wallin played for parts of three seasons with Adirondack, plus a stint with the Rapid City Rush, before being traded from the Thunder to Maine prior to the start of the 2018-19 season. Wallin reached the AHL in 2017-18 and 2018-19, playing stints with the Binghamton Devils and Hartford Wolf Pack. He served as an alternate captain each of his two seasons as a player for the Mariners. Wallin founded Evolution Hockey Camps in 2019, teaching hockey skills to players of all ages. After leading the Mariners to their best season in franchise history, Wallin was awarded a two-year extension and promoted to General Manager in April of 2023. Terrence currently lives in Portland with wife, Erin and son, Wes.

The first captain in franchise history was named Assistant Coach in August 2024, after Johnny McInnis stepped down from the role. An ECHL veteran of over 450 games, "Tolks" sported the "C" for the Mariners over their first two seasons from 2018-2020. The 34-year-old was born in Lino Lakes, MN and played collegiately at Quinnipiac University, before making his ECHL debut for the Elmira Jackals in 2014. Along the way, Zach also played for the Missouri Mavericks, Rapid City, Rush, and Wheeling Nailers. He spent his final playing season with the Fort Wayne Komets in 2021-22.

Brian McQueen joined the Mariners in September 2021 after three years in the SPHL with the Knoxville Ice Bears. He was named SPHL “Equipment Manager of the Year” in 2020. A native of Boston, MA, McQueen moved to Missouri where he attended the University of Central Missouri, earning a degree in Sport Management, and where he played inline hockey as a part of the NCRHA. He also gained experience in the ECHL as an equipment intern for the Kansas City Mavericks in 2017-18. Since 2015, Brian has also spent time working for the Kansas City Chiefs during their training camp, as well as a full season in 2017. Brian is excited to be returning to the east coast and currently lives in Westbrook.

Patrick Sponzo became the Mariners Athletic Trainer in October of 2023, following the departure Matt Salmen for the AHL. A native of Windsor, CT, Patrick was the head athletic trainer for the Greensboro Swarm, the G League affiliate of the NBA’s Charlotte Hornets in 2022-23. He’s also worked in the collegiate ranks at The College of the Holy Cross, the University of Hartford, Stony Brook University, and Florida Gulf Coast University. He earned his Bachelor's of Athletic Teaining at Lasell University in 2016.