Rob Andersen enters his twelve season as Assistant Softball Coach at Merrimack College in the 2023-24 academic year.

Andersen helped the Warriors to the NEC playoff tournament for the first time in school history. As well as helping the team reach the NEC championship game in 2023, while seeing the team end the season with an .375, while ending ending fourth in the division. 

Andersen helped guide the Warriors to their 15th NCAA Tournament appearance in 2018, while seeing the team hit an even .300 on the year, which was second in the Northeast-10 Conference, behind Saint Anselm.

Andersen enjoyed his most successful season as a member of the program in 2017, helping guide the program to is 14th NCAA Tournament appearance and first in six years. The Warriors won 35 games - the most in 13 seasons - and boasted eight all-conference selections, four all-region nods and one Academic All-American. He helped the pitching staff post a league-best 2.19 ERA with five different pitchers.

Andersen saw a very successful season in 2023 as the team made it to the NEC championship game against LIU. were the team was runner up in this game. The team had a winning in conference record of 11-10 while seeing the team reach multiple accomplishments of their own. With 2 NEC players of the week, an NEC softball player of the year, a NEC All-Conference second team, three NEC All-Tournament Honors, and a NFCA Great Lakes Region Second Team. 

In 2016, he helped guide the Warriors to a return to the NE10 Championship, with three All-Conference and one All-Region selection. In his second season, he helped produce two all-conference honorees in 2015 as a young Merrimack squad nearly captured a spot in the NE-10 Championship. His leadership also played a role in Merrimack's return to the postseason in 2014 after the Warriors advanced to the NE-10 Quarterfinals for the first time since 2011. 

Andersen brings a passion for the sport, along with tremendous knowledge of the nuances and strategies of the game. Andersen coaches with the East Coast Firecrackers and is a long-time youth hitting instructor.