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GGTC is very proud of our talented, experienced, and knowledgeable coaches for 2017.


A triathlon pioneer, Duane is a founding member of the GGTC, has competed since 1981 and coached since 1986. He has competed in nearly 300 triathlons, including 13 Ironman events and is a five-time Hawaii Ironman finisher with a PR of 10:09 set at the age of 40. He has won age group titles at Wildflower, Vineman, World’s Toughest Half, Escape from Alcatraz and others. Coach D has successfully coached hundreds of athletes of all ages and abilities that range from novice to elite.

His systematic Ironman training approach has resulted in more than 100 Ironman finishes. His elite athletes have set world records and won overall and age group titles, including The Ironman World Championship. Duane has a Masters degree in Exercise Physiology and is certified by the American College of Sports Medicine and USAT. He has published and or been featured in Competitor and Triathlete magazines as well as For more information on Duane’s services contact or visit


John is bringing his years of triathlon coaching and racing expertise to the Golden Gate Triathlon Club to help us all become better athletes. John coaches club swimming program and GGTC Olympic Distance Training Program. He is the former Head Coach of the The University of California at Berkeley Triathlon Team. During his 4 years at Cal his athletes earned 4 National Titles, 2 runner up Titles and the Cal Team never finished off of the podium as a Combined Team during his 4 year tenure.

John is also an age group and masters swim coach at Saint Ignatius College Prep and Fog City Masters. John's racing resume includes being 2009 Collegiate National Champion, 3X winner of the Vineman 140.6 Triathlon, and a USAT All American Athlete among other notable achievements.


Holds certifications with USA Triathlon, American College of Sports Medicine, and Crossfit.Triathlete accomplishments include first time triathlon finishes, ironman finishes, podium finishes, qualifications to Kona, Las Vegas, and Nationals not to mention pro card qualification. Specializes integrating Crossfit strength and conditioning with traditional endurance training for better performance and injury prevention. Splits his time coaching triathletes online with in-person and groups coaching down at San Francisco Crossfit. Proudly launching Helming Athletics with a specialized Crossfit/Triathlon program for the Golden Gate Triathlon Club.


Michael Olzinski is also an experienced coach and triathlete. He has a Master's in Exercise Physiology, certified in nutrition, and track and field. As a Coach for the purplepatch fitness team he has been exposed to some of the very best coaching techniques from all over the world. Involving different training phases, key sessions, recovery workouts, training the mind, eating right, and so much more. He has coached a variety of athletes to accomplish their goals from Alzheimer's patients to professional triathletes. He knows how to create a program to help you meet your goals based on what is realistic for your lifestyle.


Coach Tyler Stewart works with GGTC athlete's primarily through SHIFT-SF, San Francisco premier indoor cycling studio, where she is the main coach for the clubs indoor cycling series. Tyler's approach to cycling is rooted in the fundamentals of the sport. Believing you can't truly progress as an athlete until you become proficient with the basics and fundamental building blocks of cycling.  Coach Tyler is also a former professional triathlete and multi-time Ironman Champion and holds the women's Ironman all-time bike record (4:42:40).


Coach Dorette Franks RDN a Registered Dietitian Nutritionist with an emphasis in Sports Nutrition, will be handling GGTC's Women For Tri women's specific training group in 2016. Dorette is a former head coach for the Nike Women's Full and Half Marathon and the SF AIDS and Foundation “Greater than One” training programs. She served as track and running coach for the Golden Gate Triathlon Club for almost a decade. Dorette holds coaching credentials and certifications from USA Track & Field, USA Triathlon, and the Road Runner's Club of America. She is a dietician with an emphasis in Sports Nutrition. Articles by Dorette have appeared in TRIATHLETE, RUNNER'S WORLD, SHAPE and WOMEN'S HEALTH magazines. For more information contact or visit


With over 12 years of swim coaching experience, Tammy has a passion for working with individuals from all swimming levels. She started competitive swimming at a young age of five and went on competing at the Division I collegiate level at Loyola Marymount University while also playing water polo for 2 years. Upon graduating, she developed the passion for coaching and sharing her knowledge of the sport by head coaching Mills High School and age-group coaching at Burlingame Aquatics Club.

As she put more focus on her professional career, she started working for FINIS Inc. as a Marketing Events Coordinator where her exposure and involvement in the triathlon community began. Since then she has had many opportunities to work with various triathlon teams and athletes through running specialized pool and open water clinics. She is currently a master’s swim coach and the tri swim coach at The Bay Club San Francisco. Her main focus as a coach is instilling the correct basics and technique to produce the most effective and efficient swimming for every individual athlete.