Marshall was named the CBU Assistant Men's Soccer Coach in February of 2016 after previously coaching at Northwest Nazarene with Coach Coe Michaelson. He assisted in all aspects of the Crusader men's soccer program, has a USSF D License and also taught classes in the NNU Kinesiology Department. He also coached club soccer for the Boise Nationals where he led the BNSC Milan team to the Idaho Youth Soccer State Cup Championship and the Far West Regionals Quarterfinals in 2014. As a player, Stephen was a three time All-GNAC selection for the Crusaders from 2010-2012. He was a key defender for the squad as they finished 2nd in the GNAC in 2012, narrowly missing out on the NCAA National Tournament. He was also a three year captain and a two-time Academic All-Conference selection. Additionally in 2012, he was an NSCAA All-Region selection both athletically and academically. Prior to attending NNU, Stephen played NCAA Division I soccer at Cal Poly San Luis Obispo. As a youth player he was a member of the most successful youth soccer team in the history of US Youth Soccer, Arsenal '89 out of southern California. He was a co-captain on the squad that went to four consecutive National Championship matches, including National Championship victories in 2004, 2005 and 2006.