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Diablo Coaching Staff

Robby Arroyo

Robby Arroyo

Head Coach, CEO

Team(s): 16U Boys

Robby became passionate about water polo at a young age. He has won major water polo events like National Junior Olympics, Champions Cup, CIF-SS D1, MPSF Conference, and many more including with Team USA and Professionally. While in high school he trained with the 1996 Olympic Team alongside his older brother Gavin. Robby has been focused on expanding the sport of water polo for both boys and girls at multiple levels along with hosting local tournament opportunities to aid in the expansion of the sport (CCCA Regional & State Championships, CAL Cup, ODP National Championships, etc.)

Mimi Harris

Mimi Harris

Head Coach & Goalie Technical Director

Team(s): 12U Girls

Mimi started her water polo career in 2008. In 2010 she moved clubs and played for Diablo during her high school career. She played for Monte Vista High School and was a four year varsity athlete for water polo and swimming. In her senior year she was a captain for both. Mimi then attended CSU Long Beach and played four years of Div l water polo. She graduated in 2018 and moved back to the Bay Area. She plans to further her education next coming years.

Scott Harvey

Scott Harvey

Head Coach

Team(s): 12U Girls

Scott started swimming when he was 9 and naturally took up water polo when he was 13. He played water polo and swam at Washington high school in Fremont. He was an All-American at Ohlone JC before graduating from UCSD where he was captain of the club team. Upon returning home he began coaching water polo and swimming at Washington high school. When not on the pool deck he enjoys snowboarding, hiking with his dog and going to A's games in the summer.

Misha Buchel

Misha Buchel

Head Coach

Team(s): 14U Girls

Misha has been a member of the Diablo coaching staff since 2005. He began his water polo life at Clayton Valley High School in Concord where he was a 1st Team All-NorCal player. After graduating from UCSD with a degree in Bioengineering, he began coaching the boys and girls teams at La Costa Canyon High School in Carlsbad, CA. Since moving to northern California in 2005 Misha has coached the varsity girls water polo team at Acalanes HS, leading them to multiple NCS championship games winning in 2016 (Division 2) & 2018 (undefeated season in Open Division). When he’s not coaching water polo, he’s either teaching math at Acalanes HS (where he was named Teacher of the Year in 2012), or spending time in the outdoors with his wife Brittany and sons Jonas and Peter.

Catharine von Schwarz Arroyo

Catharine von Schwarz Arroyo

Head Coach & COO

Team(s): 16U Girls

Cat has been involved with water polo with water in some way or another since she was 12 years old. The sport has given her so much and she could not imagine what her life would be like without it. Born in Annapolis, Maryland there was not much opportunity for girls playing water polo, so she played with the boys. From there she was recruited to play at UCLA and went on to play with the US Team and was the first American woman to play professionally in Italy. Some of Cat’s water polo accomplishments are listed below

Scott Turner

Scott Turner

Head Coach

Team(s): 18U Girls

Scott began his water polo coaching career helping with his oldest daughter back in 2011 in age group water polo. He enjoyed working with the children and wanted to give back to the sport that he had played since he was in 8th grade, that he volunteered to be the" JV Coach at Monte Vista High School in 2012. The following year he took over the Varsity coaching position and coached for the next 4 years, ending in 2016. In 2017, he decided to leave the high school coaching ranks, because his youngest daughter Maile decided to play water and now he helps with the 14U at Diablo Alliance.", His philosophy is hard work and good fundamentals can make any player improve."

Heather Rosson

Heather Rosson

Head Coach

Team(s): 10U Girls and Boys

Heather started playing water polo as a Freshman for Las Lomas High School in 2009. She played club for 680 Drivers from winter of 2009 till summer 2013. After graduating high school, she attended Lindenwood University in St. Charles, Mo. She played for the college’s team for 5 years. Her team went to the Collegiate Water Polo Association Nationals her freshman year, earning 5th place, and her last year, earning 4th place. Heather graduated in May with a Sport Management degree. This fall, she started her water polo coaching career as College Park’s Head JV coach and Assistant Varsity coach.

Todd Halvorson

Todd Halvorson

Head Coach

Team(s): 14U Girls

Todd has over 22 years of coaching experience and numerous accomplishments to his name. His teams continually finish in the top tier of every tournament and rank as one of the top age group teams in the Nation. In addition he has sent 3 players on to play in the Olympics.

Jim Hassett

Jim Hassett

Head Coach

Team(s): 12U Girls, 18U Girls

Jim brings over three decades of experience in swimming and water polo to Diablo Alliance. His accomplishments starting from his days at Washington High School in Fremont to swimming in the 1996 Olympic Trials and playing water polo in numerous FINA Masters World Championships are listed below:

Charles Lewandoski

Charles Lewandoski

Head Coach

Team(s): 12U Boys, 14U Girls, 14U Boys, 18U Boys

Charles was first introduced to water polo his freshman year of high school at Granada high in 2011 and instantly fell in love with the sport. he continued to learn the game of water polo and thrive, ultimately becoming captain of the team the following season. Even during the off season, he continued training and spent his winters and summers playing for the Lazers water polo club in Livermore. Charles went on to play for the Las Positas Hawks water polo team and also swam competitively for two years. During his time as Las Positas, he attended many tournaments and worked the desk to gain experience/perspective of the game outside of the pool. After completing 2 years at LPC, Charles was recruited by the University of La Verne to play Division 3 water polo for the NCAA. He has played one season with the program so far and has gained incredible experience playing in Southern California. He will be continuing to play at La Verne for the next 2 years while he completes his education.","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"paragraphData":{"textStyle":{"textAlignment":"AUTO"},"indentation":0}},{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"0tj8m9763","nodes":[],"type":"PARAGRAPH"},{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"etpv09764","nodes":[{"type":"TEXT","id":"","nodes":[],"textData":{"text":"Playing Career:","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"type":"PARAGRAPH"},{"type":"BULLETED_LIST","id":"4geht9779","nodes":[{"type":"LIST_ITEM","id":"ramx29780","nodes":[{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"d82ff9766","nodes":[{"type":"TEXT","id":"","nodes":[],"textData":{"text":"Granada High School, Livermore ,CA 2011-2015","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"type":"PARAGRAPH"}]},{"type":"LIST_ITEM","id":"12nhp9782","nodes":[{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"sw4sa9768","nodes":[{"type":"TEXT","id":"","nodes":[],"textData":{"text":"Lazers Water Polo Club, Livermore, CA 2011-2015","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"type":"PARAGRAPH"}]},{"type":"LIST_ITEM","id":"7pb1p9784","nodes":[{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"xty4s9770","nodes":[{"type":"TEXT","id":"","nodes":[],"textData":{"text":"Las Positas College, Livermore, CA, 2016-2018","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"type":"PARAGRAPH"}]},{"type":"LIST_ITEM","id":"8cxbk9786","nodes":[{"paragraphData":{"textStyle":{"textAlignment":"AUTO"}},"style":{},"id":"qi8lc9772","nodes":[{"type":"TEXT","id":"","nodes":[],"textData":{"text":"University of La Verne, Los Angeles, CA 2018-Present","decorations":[{"type":"COLOR","colorData":{"background":"transparent","foreground":"rgb(var(--color_15))"}}]}}],"type":"PARAGRAPH"}]}],"bulletedListData":{"indentation":0}}],"metadata":{"version":1,"createdTimestamp":"2023-03-01T20:24:41.901Z","updatedTimestamp":"2023-03-01T20:24:41.901Z","id":"19be8477-a3e8-4d6d-85ae-68df12f6fa62"},"documentStyle":{}}

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