Stephen Andersen is in his second full year on the swimming & diving coaching staff.

Andersen spent the 2022-23 season as a volunteer assistant with the Terriers, working with all groups. In August 2023, he transitioned into the role of full-time assistant.

Prior to his time with Boston University, Andersen spent six years coaching with Commonwealth Swimming and was a two-time silver medal USA Swimming club excellence award winner (2020, 2022). Andersen has helped coach athletes who have represented Team USA on the Junior National Team, as well as attended both the Junior World Championships and Junior Pan Pacific Games. In addition, he has helped coach three U.S. Olympic Trials qualifiers, eight Summer Junior National Qualifiers and numerous Winter Junior National Qualifiers. Since he began coaching with Commonwealth Swimming, his athletes have set 12 LSC records.

As a coach for Commonwealth Swimming, Andersen was able to travel to the United States OTC to attend the USA Swimming Girls National Select Camp, designed for the top USA Swimming member athletes in the nation. He was also awarded a 30 Under 30 grant to attend the American Swim Coaches Association World Clinic in 2023 as one of the top young coaches in the nation.

Andersen graduated from Saint Michaels College in 2017 with a degree in economics. He swam all four years and was named captain his senior season.