Coach Clapper is also the head coach for the ASU Women’s varsity squad which competes in the  highly-competitive Mountain Pacific Sports Federation (MPSF).  
Clapper, a native of Hollidaysburg, Pa., and 1997 graduate of Slippery Rock University in Slippery Rock, Pa., is set to begin his third head coaching position overall and second at the collegiate level. Prior to ASU, Clapper served as the head coach of both the men's and women's programs at Brown University from 1999-2004. Before that, he was the head coach of Wissahickon High School in 1998. He also served as the interim head coach for the Sun Devils during the past summer after the program's only head coach, Vicki Gorman, resigned to pursue other professional opportunities.
A four-year letter winner at The Rock as a goalkeeper, lapper was selected for several coaching accolades, including coach of the year in the New England (2000), Eastern Championships (2001, 2003), Northern Division (2002) and Northeastern (2004) categories. In 2001, he guided the Bear women to an appearance in the inaugural NCAA Championships, a rare feat for an eastern team in a western-dominated sport.
Prior to his time as a coach, Clapper competed for The Rock from 1993-97 and captained the team as a senior in 1996. A former walk-on, he helped lead the team to a Top 15 national ranking after taking over the starting goalie duties as a sophomore. Also as a senior, he was a second-team all-conference selection.
Out of the pool, Clapper excelled academically, graduating Cum Laude with a BS in Exercise Science (aquatic emphasis) while also attaining a minor in Adapted Physical Activity and Rehabilitation.

Ryan Castle will begin his first year at the graduate assistant coach with the Arizona State University water polo program and comes to Tempe with a wealth of international coaching experience. Assigned to assist the coaching staff with day-to-day activities such as practice and travel, Castle also serves as the head coach of the ASU men's club team that placed 13th at the 2007 National Collegiate Club Championships along with coaching the Sun Devil Clubs. Castle also competed with Sun Devil Head Coach Todd Clapper at the 2007 U.S. Maters Championships where their team won the national title.

Prior to arriving in Tempe, Castle coached the South Irvine Water Polo Club during the 2006-07 season and helped the team to a ninth-place finish at the Junior Olympics. Also in 2006, he was selected as an assistant coach for the Waterpoloplanet.com/Turbo European All-Star Select Team that competed in the Junior Olympics and finished fourth.

In South Africa, Castle was an assistant coach (2003-05) with the South African Senior National Team while also serving as the head coach of the National `B' Team in 2004. In 2003, he was selected as the coach of the South African Youth National team as well as the Western Province region's senior provincial women's team head coach in 2003 and the men's team in 2004, which finished second in the Currie Cup. Also in 2003, he guided the University of Cape Town women's team to a bronze medal at the 2003 South African University Aquatics Championships.

Starting in 1997, he coached at Wynberg Boy's High School for five years before taking over at Reddam House College in 2002. Between 2001 and 2005, he served as the provincial age group boys and girls teams coach for the Western Province region.

A native of Cape Town, South Africa, Castle graduated from the University of Cape Town with a degree in Information Systems in 2001 and a post graduate Credential in Education in 2003. He is currently working toward his Master's degree in Physical Education at Arizona State.