Marco Koolman was named the head men's soccer coach at the College of the Holy Cross on March 29, 2012. The 11th head coach in the history of the Crusader men's soccer program, Koolman owns a career record of 201-75-28 as a collegiate head coach, and currently ranks 13th all-time in NCAA Division II history with a .707 career winning percentage.

Koolman came to Holy Cross from the Spire Institute in Geneva, Ohio, where he served as the head coach and director of soccer from July of 2011 to March of 2012. He was previously on the staff at Boston College for two years, during the 2009 and 2010 seasons. Koolman helped the Eagles to an overall record of 10-5-5 and a trip the NCAA Tournament as associate head coach in 2010, while Boston College went 14-9-0 and made the third round of the NCAA Tournament in 2009 when he was an assistant coach.

Koolman spent nine seasons as the head coach at Franklin Pierce University from 2000-2008, with the Ravens winning the NCAA Division II national championship in 2007. Franklin Pierce went 127-46-22 overall and 86-21-10 in the Northeast-10 Conference during Koolman's tenure, making six consecutive appearances in the NCAA Tournament from 2003-2008. In addition to winning the national championship in 2007, the Ravens were the national runner-up in 2005 and advanced to the national quarterfinals in 2004.

Koolman also led his Franklin Pierce teams to three straight Northeast-10 regular season titles from 2005-2007, and the Northeast-10 tournament championship in 2006. He was named National Coach of the Year by the National Soccer Coaches Association of America in 2007, in addition to being honored as the NSCAA New England Coach of the Year three times (2004, 2006 and 2007).

Prior to his time at Franklin Pierce, Koolman was the head coach at Gannon University from 1991-1996. He led the Golden Knights to an overall record of 74-29-6 during his six-year tenure, with the team advancing to the NCAA Division II national semifinals in 1993. Koolman also earned NSCAA National Coach of the Year honors in 1993.

A native of the Netherlands, Koolman earned his bachelor's degree in business administration from Gannon in 1991, then went on to receive a master's degree in health services administration from Gannon in 2001. He was a four-year letterwinner for the Golden Knights from 1987-1990, and still ranks second all-time at Gannon with 44 career assists.