Since taking over as interim head coach in 2017 and full head coach in 2018, Greg Mulholland is 89-25-18 with six RMAC Regular-Season titles, five RMAC Tournament crowns and five NCAA Tournament appearances including two trips to the Sweet 16. He became the first coach in program history to win three straight RMAC Regular Season and Tournament Championships in 2020, and extended that streak to four straight in 202-21. In the fall of 2022, Mulholland became the first coach in the history of the RMAC to win six straight RMAC Regular Season titles. Additionally, Mulholland is a four-time RMAC Coach of the Year and head of the 2019 and the 2020-21 United Soccer Coaches South Central Regional Staff of the Year. The Littleton, Colo., native initially joined the Orediggers in 2007 as the program's assistant coach.

During his time at the helm, Mulholland has coached six individuals to a total of 13 All-America awards. His guidance has also led to 28 All-RMAC honors including 17 first-teamers, 13 on the second team and five honorable mention selections. Additionally, Mulholland's resume features the 2017 RMAC Player of the Year in John Haist who scored the most goals in the country that season. Haist also won Regional Player of the Year in 2017 and 2018. Jason Zobott won RMAC Player of the Year in 2019 and brought home RMAC Defensive Player of the Year in 2018 and 2019. The defender also earned CSC (College Sports Communicators) Academic All-America of the Year honors in 2019. He was only the second student-athlete to win the award in all of Mines Athletics history. In 2022, Michael Sprauer was named RMAC Academic Player of the Year and repeated as a CSC Academic All-American.

Mulholland's most recent RMAC title came in the fall of 2022 as he guided the Orediggers to an overall record of 13-5-2 and going 9-1-0 in conference play. The Orediggers collected their sixth-straight RMAC regular season title with a 4-0 win over Westminster in the regular season finale before claiming their fifth RMAC tournament title in six years, playing CSU Pueblo to a 3-3 draw at the conclusion of extra time in frigid conditions at Stermole Stadium before taking home the cup in a thrilling 10-round penalty shootout which Mines won 9-8, with freshman Marc Levin converting the winning try. Mines advanced to the NCAA Tournament and earned a first round bye, facing #3 Cal State Dominguez Hills in the second round but coming up short by a final score of 3-1. Mulholland was named RMAC Coach of the Year while six players were named All-RMAC honorees including Tristan Semelsberger (First Team), Michael Sprauer (First Team), Lucas King (First Team), Azad Iliozer (Second Team), Brian Doherty (Honorable Mention) and Caelin David (Honorable Mention). Semelsberger, Sprauer and King were each named All-Region selections with Semelsberger and King earning All-America honors. Sprauer earned CSC Academic All-America honors for the second season in a row.

Mulholland led the Orediggers to an overall record of 14-4-2 in 2021 while going unbeaten in conference play at 9-0-1. It extended Mines' unbeaten streak in RMAC play to 19 straight matches dating back to Oct. 27, 2019. Mulholland and the Orediggers clinched their fifth consecutive regular season crown and in a 1-0 victory at Westminster in the regular-season finale after taking down then #12-ranked Colorado Mesa in double overtime at Stermole Stadium. It also marked Mines' fourth unbeaten conference season. The Orediggers' regular-season performance eventually led them to a first-round bye in the NCAA Tournament before facing #11-ranked Colorado Mesa in the second round in Grand Junction. The final result was a 0-0 draw with CMU advancing on penalty kicks by a margin of 3-2. Mulholland was voted RMAC Coach of the Year. Lucas King, Tristan Semelsberger and Patrick Allan were voted First-Team All-RMAC. Michael Sprauer and George Marchant earned Second-Team All-RMAC. King, Semelsberger, Sprauer and Allan were also named all-Region while King went on to claim two all-America awards. Allan and Sprauer were voted CSC Academic All-America.

As an assistant, Mulholland aided Mines to a cumulative record of 128-55-22 and four NCAA tournament berths. He also helped the Orediggers claim three RMAC Tournament titles and the 2010 and 2015 RMAC regular season championships. The 2015 season also proved Mines' best in program history, completing an unbeaten regular season while capturing the RMAC regular-season and Tournament titles. The Orediggers then went deep into the NCAA Tournament, winning the NCAA South Central regional title with a road win at Midwestern State before bowing out in overtime of the Elite Eight to Cal Poly Pomona. Mines ended the season 18-1-3 and was ranked #8 by the NSCAA.

Prior to his arrival at Mines, Mulholland spent six years as the assistant and goalkeeper coach at Chatfield High School where he helped the program to a state championship in 2004 and numerous top-10 rankings. In addition, he was the Director of Goalkeeping for The Colorado Girls Soccer Academy from 2002-05.

He formerly served as team and goalkeeper coach for Real Colorado of the U.S. Soccer Development Academy.

A native of Littleton and graduate of Central Bucks East High School in Buckingham, Pennsylvania, Mulholland earned his bachelor's degree from Millersville (Pa.) in 2001.