Robby Arroyo - Varsity Head Coach

Robert Arroyo, a previous coach with the Diablo Alliance and Lamorinda Girls Water Polo Clubs, was the first head coach of Las Positas' new men's water polo team before joining the Acalanes Boys Water Polo coaching staff in June 2018.

Arroyo, who has also coached at Long Beach State and for various other clubs in California was also a former competitor on USA Youth, Junior, and National Water Polo teams. Arroyo played professionally in Europe, and prior to that, he was a 4-year starter and team captain at Cal. 

In high school, he was a 4-year All-American at Foothill High in Santa Ana and was also named All-CIF-Southern Section, All-OC County, All-League in swimming and water polo, and was the CIF-SS Water Polo Player of the year in 1997.  In high school, he also had the opportunity to train with the US Olympic team alongside his older brother Gavin.

Andrew Long Kettenhoffen - JV Head Coach

From Livermore, CA.  Played varsity water polo at Livermore High School 2011-2014.  Graduated Livermore high 2015.  Attended Las Positas college 2015-2018.  Played water polo at Las Positas 2015 and 2017

Currently attending UC Berkeley as an economics major.  Coached JV and was Asst Varsity Coach for Amador Valley High School 2017

Colton Hamming - Varsity Assistant Coach

Colton is from San Clemente, a small beach town in Southern California, where he started playing water polo at age 9. He grew up

playing for Orange County Water Polo Club with his two triplet brothers, Chase and Michael. Colton played for San Clemente High School where he was a four-year varsity letterman and earned All-South Coast League Honors for the water polo and swim teams.

Post-high School Colton continued his water polo career with his brother Chase at UC Berkeley where he is now the Undergraduate Manager for the Cal Men's Water Polo Division I team. He will be a senior this season studying Political Science and Public Policy.

Colton has coached club water polo in San Clemente and continues to coach with a club in the East Bay.


A coach is someone who tells you what you don’t want to hear, and has you see what you don’t want to see, so you can be who you’ve always known you can be.
— Tom Landry

Steve Heaston, Acalanes Head Coach

1971 - 1982

6 North Coast CIF Championships

Coached 38 high school All-Americans

Career Record 183-57

Ron Richison, Acalanes Head Coach

1984- 1995  

League Champions (1986, 1987, 1988) CIF-North Coast Section Champions (1986, 1987, 1988) California State Champions – 1987 

Ron Richison has been an incredible contributor to the development of the sport of water polo in the East Bay of California and in Northern California. In 1967 Ron, with Bill Brown (Miramonte & US WP Hall of Famer), Pete Cutino and Ervin Zador (Hungarian Olympian), helped establish water polo as a league sport in what was then the FAL league (now DFAL). In 1966 teams from Acalanes High School, Miramonte HS, Las Lomas High School competed as club teams.  The interest in water polo coincided with the arrival of Pete Cutino (US Water Polo Hall of Famer) as the coach of the Aquabears Swim Club. Pete and Ron introduced water polo as a way to keep kids in the pool during the fall, which had, in the past, been the off season for competitive swimming. Needless to say, it was a big hit. Eventually they got the FAL to approve the sport.  Ron and Pete then founded one of Northern California's premier and most successful club programs in the country, Concord Water Polo Club, in 1967.  With Concord Water Polo club (now Lamorinda Water Polo) Ron produced numerous High School All Americans, (22) College All Americans, (24) players who became NCAA Champions, and (9) United States Olympians.  He also coached (5) members of the United States Water Polo Hall of Fame.  Ron was a pioneer for water polo in one of the biggest water polo zones in the country.