University of California - Riverside Men's Basketball

Reuben Williams is joining the UC Riverside coaching staff ahead of the 2025-26 season following two highly successful years as an assistant coach at the University of Montana under head coach Travis DeCuire. During his time in Missoula, Williams helped Montana to one of its most productive stretches in program history. The Grizzlies tallied 49 wins over two seasons — the fourth-most in any two-year span in school history — highlighted by a 25-win campaign in 2024-25, the program’s first 25+ win season since 2018-19. Montana finished ranked No. 21 in the final CollegeInsider.com Mid-Major Top 25 Poll — the program’s highest ranking since 2019. In his first year, Montana finished 24-12 and won a postseason game for the first time since 2006 and just the second time ever. That 2023-24 team set a new program record with 2,768 total points scored in a single season and shot a program-best 79.2% from the free throw line.  Williams played a pivotal role in both recruiting and player development at Montana. He helped develop Brandon Whitney, the 2024 Big Sky Tournament MVP, who set career highs in assists and three-point percentage while graduating as the program’s all-time assist leader (443). He also developed Malik Moore, an All-Conference selection and one of the Big Sky leaders in three-point percentage, and Aanen Moody, who became just the third player in program history to score 1,000 points in two or fewer seasons, earning First Team All-Big Sky honors. Prior to Montana, Williams spent the 2022-23 season as a graduate assistant at Arkansas with Coach Gus Argenal. Under Coach Musselman, the Razorbacks went 22-14 and reached the NCAA Sweet 16, upsetting No. 1 seed Kansas. In his lone season he worked closely with a star-studded roster that included four future NBA players: Jordan Walsh (Boston Celtics), Anthony Black (Orlando Magic), Nick Smith Jr. (Charlotte Hornets) and Ricky Council IV (Philadelphia 76ers). Before moving into the college ranks, Williams coached at his alma mater, Long Beach Poly High School, for three seasons. He helped lead the Jackrabbits to three league championships and played a key role in player development and in-game strategy. He notably coached and helped develop Peyton Watson, the 2021 California Gatorade State Player of the Year and current Denver Nuggets wing. Several other players under his guidance earned college scholarships. Williams also brings Big West experience as his time as student manager at Cal State Fullerton. He also has grassroots AAU experience coaching with BTI and ALL IN elite. He played collegiately at Willamette University after graduating from Long Beach Poly in 2016.  

Matthew Musselman enters his first season as an assistant coach with the UC Riverside men’s basketball program in 2025–26. Respected for his expertise in recruiting, scouting, and player development, Musselman has contributed to the success of several top-tier college basketball programs and played a pivotal role in recruiting and shaping the careers of numerous professional players. Born in Atlanta Georgia, raised in the Northern California Bay Area / San Diego, Matthew Musselman is a rising figure in collegiate basketball coaching. He comes from a coaching background where both his father (Eric Musselman) and grandfather (Bill Musselman) were head coaches at the NBA and Division One level. He is known for his strong work ethic, recruiting tactics, and strategic understanding of the game.  Most recently, Musselman served as a graduate assistant for the University of Southern California Men's Basketball program during the 2024–2025 season under head coach Eric Musselman, where he played a key role in game preparation, player development, and recruiting operations. He assisted USC bringing in the #7 ranked transfer class and #34 ranked high school class which includes five star McDonald's All American Alijah Arenas. Prior to USC he worked as a Graduate Assistant at the University of Arkansas during the 2023-2024 season where the Razorbacks spent four weeks ranked in the top 25.  Holding a Bachelor of Arts in Communication Studies from the University of San Diego and a Graduate Certificate in Gerontology from the University of Southern California, Musselman brings a well-rounded academic background that complements his on-court experience. With a clear comfort level in live training environments, Musselman is uniquely equipped to contribute in both strategic and hands-on coaching roles.  Driven by a passion for the game and a dedication to recruiting and player development, Matthew Musselman exemplifies the next generation of intelligent, forward-thinking basketball minds. His foundation in elite programs, coupled with his deep commitment to growth and precision, position him as a valuable asset to our coaching staff here at UC Riverside.