Orinda Aquatics Coaching Staff



The coaching staff of Orinda Aquatics brings extensive experience, strong ties to the community, and a deep passion for coaching and working with children to the team.  The team is run by its two co-founders, Ron and Don Heidary. Both have enjoyed tremendous success at the recreational, high school, and USA Swimming levels. They have a combined 70 years of coaching experience and are ASCA Level 5 certified at both the USA Swimming and High School levels.

In 1984 with just twelve swimmers, Ron and Don created the Polar Bear Fall Swimming program. The program currently hosts over 500 Fall Swimmers in the Lamorinda area.  From the Fall Program, in 1995, they created the year-round team, Orinda Aquatics. From a humble beginning with twenty recreational swimmers, the year-round program has achieved remarkable success while averaging 100 YR swimmers over its lifetime. In the year 2000, Orinda Aquatics was possibly the youngest and smallest team to ever win Junior Nationals (short course in Anchorage, Alaska).  Orinda Aquatics qualified twenty swimmers for the long course Junior Nationals that year and had the second most entries in the meet.  And with less than eighty year-round swimmers, the team has also won Sectionals, Far Westerns, and the Pacific Swimming Age-Group Championships, and had twelve (current or former) OA swimmers qualify for the 2008 Olympic Trials, with two - Kim Vandenberg (800 Free Relay) and Peter Varellas (Water Polo) making the team and receiving medals.

Orinda Aquatics has been a perennial Silver Medal Club in USA Swimming's Club Excellence program and is a Level 4 team in USA Swimming’s Club Recognition Program (only the second in the Western Zone to reach this level).  Orinda Aquatics consistently finishes among the top “smaller” clubs in USA Swimming’s Virtual Club Championships, finishing first in 2009 for teams under 150 members.  For each of the past fifteen years, the team has averaged : six to ten Junior National, fifteen Santa Clara Grand Prix, thirty-five Sectional qualifiers, and six to ten Scholastic All-Americans.  Ron and Don have coached over twenty Olympic Trials qualifiers (six alone in 2012) and well over 100 high school All-American swimmers.

While coaching the nationally competitive local summer-league, Ron and Don won a combined twelve OMPA (Orinda Moraga Pool Association) and ten Contra Costa County championships. As high school coaches in the North Coast Section (NCS), Ron and Don have won eighteen NCS Championships.  Orinda Aquatics swimmers hold eight of the eleven men’s records with times of 54.0 (100 Breast), 1:47.5 (200 IM), 20.2 (50 free), 44.2 (100 free), and 48.1 (100 Back), with 2012 national high school All-American rankings of 1st, 1st, 4th, 5th, 6th, and with Ron and Don coaching the top two high school breaststrokers in the nation.

Ninety percent of Orinda Aquatic’s graduating seniors go on to swim in college, and all want to.  The graduating class has averaged a GPA near 3.75.  The overriding philosophy of OA is putting “character first” in swimming and in life.  Ron and Don have spoken on this topic for The American Swim Coaches Association, and were asked to run a Life Skills Seminar for ASCA.  The team consistently travels with sixty-plus teenagers and no chaperones.  

The coaching philosophy of the team is based on efficient training, motivation, discipline, integrity, teamwork, and close personal relationships.  With all of their swimming success, the swimmers remember Orinda Aquatics most for the positive impact it has had on their lives.  It is truly a "big picture" philosophy at Orinda Aquatics as life lessons are employed every day, in every aspect of the program. 


Coaching Staff

Ron A Heidary

Co-Head Coach/Founder


Don A Heidary

Co-Head Coach/Founder


Marc Robert Cavallero

Assistant Coach, Junior Group


Matt C Ehrenberger

Head Age-Group Coach


Matt Ehrenberger brings nearly thirty years of coaching experience to Orinda Aquatics, with ties to Ronnie and Donnie that trace back to their early years at Pinole. Matt is Head Age-Group Coach with responsibility for the development of the Junior (pre-high school) Group, and he is the Director of the Orinda Aquatics Polar Bear Fall Program, High School Pre-Season Program and Spring Clinics.ý Additionally, Matt has been the Head Coach/Swim Team Director at Sleepy Hollow Swim and Tennis Club in Orinda for twenty years.ý Sleepy Hollow has won multiple County and OMPA Championships and is consistently one of the most successful and efficient rec teams in the county. Matt began his coaching career with the Pinole Seals recreational swim team and was an integral part of their seven Contra Costa County Championships. Matt has coached numerous Pacific and National Top Ten swimmers as well as a USA Swimming All-Time Top 100 Swimmer and Pacific Swimming Record holder.ý Matt is an ASCA Level 3 Coach andýa 1990 graduate of Sacramento State University with a degree in Physical Education.ý Matt is also the Zone representative for the Pacific Swimming Age-Group Committee.