Coaching

Marbut began his coaching career back in Washington in 1998 as an assistant at Capital High School in Olympia, where he helped guide the Cougars to the state 3A championship. He then was an assistant at Bellevue Community College, which captured a conference championship in 1999. Following that season, Marbut returned to Edmonds Community College as head coach for four seasons and earned conference coach of the year honors twice and division coach of the year three times. His record at Edmonds was 152–38 (.800), including a league record 43 wins in 2003.^[2] Marbut came under fire when a Seattle Times article stated Marbut padded his academic resume while at Edmonds CC, and Washington State, where he coached when the article came out, came out strongly in his defense.^{[5] [4][6][7]}

Prior to the 2004 season, Marbut became an assistant at Washington State under fourth-year head coach Tim Mooney,^[8] where his work with infielders led to a then-school record .971671 fielding percentage and the first winning record for the Cougars since 1998. Following just one season as an assistant, Marbut became head coach at WSU after Mooney's forced resignation in late May 2004.^[1][9][10] At the time, he was the youngest head coach in the Pacific-10 Conference, at 30 years old.^[4] With Marbut as head coach, Washington State won more than 300 games, produced 23 major league draft picks, and dramatically improved a disastrous Academic Progress Rate score.^[2]

Following WSU's consecutive post-season appearances in 2009 and 2010, when the Cougars finished second and third in the Pac-10 respectively, Marbut believed the time was right for Washington State to invest in baseball facilities to compete long-term with other programs in the Pacific-10 Conference and around the Pacific Northwest and he personally raised approximately $3 million in pledges to build a state of the art clubhouse; construction on the $10 million facility begins in 2019. Following the 2010 season, Washington State Athletic Director Bill Moos extended Marbut's contract, stating "During his tenure as WSU’s head coach the program has improved each year on the field and in the classroom. He has embraced the Cougars’ storied history by reconnecting with former players and bringing them back into the program while his vision and passion for the future cannot be matched. We have one of the best coaches in the country and this contract reflects the University's commitment and belief that continued success is on the horizon.” ^{[11] [12]}

Post-coaching

On February 17, 2016, Marbut joined the Pac-12 Network as a baseball analyst,^[13] while also serving as a scout for the Houston Astros.^[14] On March 31, 2016, Marbut became the President of the West Coast League.^[15][16]