In Mulville's first season (2007-2008) at MiraCosta, the Spartans were 7-20 overall, including a 4-10 record in in the Pacific Coast Conference. Despite playing most of the year shorthanded (only 6 players for the last 10 games of the season), the team was very competitive and continued to improve throughout the season.
Mulville began his career in 1995 as an assistant coach at the University of La Verne, an NCAA Division III school, working under Coach Terry Boesel. After 3 years helping rebuild the La Verne program, Coach Mulville was promoted to head coach.
Mulville quickly found success at La Verne; his teams finished in third place in back to back seasons. His 1998 team went 10-4 in league, while the 1999 team went 9-5. Both teams missed the playoffs by only one game each. Mulville's overall record at La Verne was 29-21, including a 19-9 record in the SCIAC conference.
After the 1999-2000 season, Dan moved up to the NCAA Division II level, joining Cal Poly Pomona (working with his college teammate Greg Kamansky) as the first assistant coach. The Broncos finished 17-10 overall, and earned a 5th place finish in the CCAA with a 13-9 league record.
After one season at Pomona, Mulville returned to his alma mater, U.C. San Diego, where he worked under Greg Lanthier as first assistant coach. Competing without scholarships in the scholarship CCAA conference, Mulville helped UCSD improve in wins and conference placing each of his three years there.
Following the 2004 season, Dan coached at Righetti High School in Santa Maria, where he assisted the boys' varsity team. Righetti went 20-5, tied for the PAC-5 league championship, and advanced to the third round of the CIF playoffs.
Mulville graduated from Loyola High School in Los Angeles, and then attended U.C. San Diego, where he played on the basketball team from 1985-1987. He earned his B.A. in Urban Studies and Planning from UCSD in 1990, and in 1999 completed his M.Ed. at the University of La Verne.