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Coaches & Directors
We are here to support your needs. If your questions are related to workouts, meets, events, goal setting, and other swimming related needs, please contact one of the coaches. For all questions related to administrative, such as dues, safety, or policy issues, please contact one of the board members.
Coaching Staff

Mary Nygren

Head Coach

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Mary has been involved with swimming for over 26 years, beginning as a youngster and continuing on up to Masters. She has been involved directly with Masters swimming and this team for over 10 years. In her younger years, she competed at the Junior National level with her specialty being distance freestyle and the I.M. events. Coach Mary is ASCA certified, a member of USA swimming as well as USMS.

Her emphasis on distance events as a youth has continued on in Masters. She enjoys participating in the open water events with swims including Trans Tahoe, Alcatraz, and the Golden Gate Bridge. She has placed in the top ten in her age-group in many of the open water and pool events. Her participation in swim meets includes several Masters Nationals, usually competing in the longer distance events.

Coach Mary began her coaching career by assisting with a variety of stroke clinics for Masters. The interaction with the swimmers and the range in swimming abilities inspired Mary to pursue coaching on a daily basis. She enjoys working with the diversity of swimmers that make up the members of Tri-Valley Masters. She also coaches an age-group USA team which allows her to keep current with all the latest swimming techniques. With her work with youngsters, she has coached the beginning swimmer up to the nationally ranked level. Stroke improvement is her goal in every workout no matter what age and ability she is coaching. She is known to give some great distance sets as well as challenging drill work with a friendly smile on her face!

Daniel Ridosko

Assistant Head Coach

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Coach Daniel has over 20 years of swimming and coaching experience. Growing up in Europe, he competed at the National level for over 10 years and placed in the top 5 several times. He also competed in the European Games Lifeguard Championships which qualified for the World Championships.  Daniel's specialty was the mid-distance and butterfly events.

He is a founder and CEO of  Tri Valley Aquaticstva. USA Swimming Age group team, quickly gaining reputation for it's quality of high end age group swimming.

He has been with Tri-Valley Masters for eleven years as a coach and swimmer. He is known to be a warm water swimmer but has competed in a few open water swims as well as pool meets. He began coaching in Europe and has been hooked ever since. Besides coaching with Tri-Valley Masters, Daniel coaches age-group swimmers with great success. He has had many swimmers in the top ten locally and nationally, as well as being selected as a coach for All-Star teams and elite camps. He has assisted with coaching several ranked USA National level swimmers as well as a World Record holder. Daniel also coached National and European ranked tri-athletes during his coaching experience in Europe. Daniel has great knowledge in stroke mechanics and is very detail oriented when coaching. He enjoys working with all levels of swimmers and is very enthusiastic and passionate about swimming. He is ASCA certified, a member of USA swimming and USMS. Coach Daniel is known for his challenging workouts and a no excuses attitude.

Loren J Pearson

assistant coach

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Christina Droubay

assistant coach

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Talia B Petit

assistant coach

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Board of Directors

Adam Conway

president

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Bart R Hess

member at large

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Robyn L Toschi

Member at Large

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Tim J Reilly

treasurer

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Lisa White

secretary

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