Additional Coaching Staff

Andrew Wilson |  Assistant Coach

Andrew Wilson joined head coach Mark Byington as an assistant coach prior to Byington's first season with the Dukes in 2020-21, having served alongside him for all seven seasons at Georgia Southern, including the final year as Associate Head Coach. The pair led the Eagles to their first-ever postseason bid and three straight 20-win campaigns in the last three years.

Georgia Southern racked up 13 all-conference selections, including Tookie Brown, who was the first Sun Belt Player of the Year in program history in 2019 and was the first player in league history to take home four First Team All-Sun Belt nods. in addition, every senior to come through GSU's program graduated during Wilson's seven years in Statesboro.

Wilson, who played collegiately at Florida State, spent six seasons as an assistant coach at Charleston under head coach Bobby Cremins before moving to Binghamton for the 2012-13 season. While at Charleston, Wilson coached alongside Byington as assistants and the pair helped lead the Cougars to an average of 22 wins a season and three postseason tournament appearances in six years.

In June of 2019, Wilson was selected to attend the Jay Bilas Coaches Leadership Program. The program was designed to identify and develop up-and-coming coaches who have the potential to be Division I College Head Coaches. The four-day leadership program in Charlotte was limited to 12 coaches nationwide who have been recognized as rising stars in the profession as assistants.

At Charleston, Wilson gained a reputation for his recruiting, opponent scouting and steadfast determination. During his time on Cremins’ staff, the Cougars advanced to the Southern Conference title game three times, produced four 20-win seasons, a regular season title in 2011 and the program’s first NBA Draft pick in 14 years when the Los Angeles Lakers selected guard Andrew Goudelock.

A native of Kennesaw, Ga., Wilson played parts of six seasons at Florida State (2001-06), where he showed his mettle by rehabilitating from two devastating injuries to become the first player in the ACC to play in six different seasons. After enduring two medical hardships, Wilson became the school’s all-time leader in games played (129). As a senior co-captain in 2005-06, he averaged a career-high 6.3 points per game and helped the Seminoles advance to the second round of the NIT.

A 2000 graduate of Harrison High School in the metro Atlanta area, Wilson was a two-time, first team all-state honoree and was the school’s all-time scoring leader upon graduation.  He was elected to the Harrison High School Hall of Fame in 2015. Wilson was the 2000 Cobb County Tip-Off Club Player of the Year and was named to The Atlanta Tipoff Club Metro Atlanta Boys Prep Team.

Wilson and his wife Lisa were married in September of 2017 and are the proud parents of Cate (11), Mackenzi (8) and Knox (2).

Xavier Joyner  |  Assistant Coach

 Xavier Joyner joined the James Madison staff prior to the 2020-21 seasons as part of head coach Mark Byington's initial staff in Harrisonburg. Joyner comes to JMU after two seasons as an assistant coach at Mount St. Mary's and a lengthy coaching career with stops at the collegiate, high school and AAU levels.

Prior to Emmitsburg, Joyner spent three years as the assistant coach and scouting director at Paul VI Catholic High School in Fairfax, Va., capped by the 2017-18 season that saw him help lead the team to a 33-4 record and 18-0 mark in WCAC play.

Joyner also spent four seasons as an assistant coach for Washington D.C.'s Nike Team Takeover, one of the top AAU programs in the country, helping the team capture the prestigious Las Vegas FAB 48 Championship in 2017, while also propelling the 16U EYBL squad to the No. 1 ranking in the nation in the final poll of the season.

He has head coaching experience at both Prince George's Community College (2010-15) and Montgomery College Germantown (2004-10). His 200 junior college head coaching victories are among the most in history and he is the only coach in Maryland JUCO history to win regional titles at two different schools.

As a player, Joyner was a member of the Husson University men's basketball program in Bangor, Maine. He was an all-conference performer and helped lead his squad to back-to-back Maine Athletic Conference Championships. Joyner was also the recipient of the Allen Kenyon Leadership Award and the Nelson Degrasse Scholar-Athlete Award.

Joyner graduated from Husson in 1995 with a bachelor's degree in business administration/marketing.

Jon Cremins  |  Assistant Coach

Jon Cremins joined the James Madison staff as an assistant coach prior to the 2020-21 seasons, coming from Georgia Southern alongside head coach Mark Byington. In Statesboro, Cremins served as an assistant coach for the 2018-19 and 2019-20 campaigns, helping the Eagles to at least 20 wins in both seasons.

Cremins also has head coaching experience, having led Spartanburg Methodist to a 55-11 mark in two seasons at the helm. He was named the Region X Coach of the Year and District X Coach of the Year for the second straight season after guiding Spartanburg Methodist to a top-25 national ranking and 29-4 overall record. The Pioneers finished the season leading the nation in field goal percentage, 3-point field goal percentage and 3-pointers made, while ranking in the top-10 in rebounding margin, points per game, turnovers per game and free-throw percentage.

Cremins led SMC to 26 wins during his first season in 2015-16 en route to being named the Region X Conference Coach of the Year. The Pioneers went 26-7 that season and ranked in the top-10 nationally in 3-point field goal percentage, rebounding margin and points per game allowed.

Prior to working at SMC, Cremins spent one season at Kennesaw State where he helped the Owls reach the Atlantic Sun Championship for the second time and saw their average season win total increase by 40 percent.

In Cremins’ two seasons as an assistant at College of Charleston, the Cougars upset top-25 Tennessee, won the Southern Conference regular-season championship and Andrew Goudelock became the program's first NBA Draft pick and All-American since 1997.

Cremins also coached two seasons for head coach Dickey Nutt at Southeast Missouri State, where the Redhawks ranked in the top-10 nationally in field goal percentage, scoring offense and assists in his second campaign.

Cremins began his coaching career at Valdosta State from 2007-09 as a graduate assistant. During his two seasons, the school posted a 42-18 record and won the Gulf South Conference East Division Championship.

The Roswell, Ga., native graduated from Valdosta State in 2007 with a bachelor's degree in history. He remained at Valdosta State to earn his master's degree in public administration in 2009.

Keith Chesley  |  Director of Operations

Keith Chesley joined the James Madison staff as Director of Operations prior to the 2020-21 seasons, accompanying head coach Mark Byington from Georgia Southern as part of Byington's first staff at JMU after serving as Director of Operations in Statesboro in 2019-20.

Prior to Georgia Southern, Chesley was in the same role at Stetson for the 2018-19 campaign, where he was responsible for all aspects of team travel and equipment while also assisting with video, scouting, and the day-to-day operations of the program.

Chesley spent two seasons as a graduate assistant with the men's basketball team at Florida State before moving on to Stetson. He coordinated the Leonard Hamilton Basketball Camp in 2017, while also assisting with individual workouts and team travel. He also managed on-campus recruiting visits and was responsible for supervising the team's undergraduate managers.

A 2016 graduate of the University of Maine at Augusta, Chesley was a two-time All-American and a two-time all-conference performer for the Moose during his four years. Chesley was named the National Student-Athlete of the Year in 2015 and was a four-time Academic All-American. He is the all-time leading scorer (2,119 points) in UMA history. The Clinton, Maine, native earned a master's degree in sports management from Florida State in 2018.

Calvin Baker  |  Director of Player Development & Recruiting

Calvin Baker joined the James Madison staff as Director of Player Development and Recruiting prior to the 2020-21 season, arriving in Harrisonburg as part of head coach Mark Byington's first staff.

Baker spent the 2019-20 season as an assistant coach at the University of Maryland Eastern Shore after three years in the same role at Paul VI Catholic High School in Fairfax, Va. There, he oversaw scouting, recruiting and player development. Baker has also served as an assistant coach with Nike Team Takeover and was the director of recruiting for Virginia's Under Armour Association grassroots program after starting his coaching career at C.D. Hylton High School in Woodbridge, Va.

A native of Newport News, Virginia, Baker played his college basketball at William & Mary in 2005-06 before transferring to Virginia for his final three years of eligibility.

He was named to the Colonial Athletic Association All-Rookie Team in 2005-06 while playing with the Tribe, then served as a team captain during his junior and senior seasons with the Cavaliers before graduating with a degree in sociology.