Who We Are

About Us

At Fitwall, we deliver the best fitness experience in the world.

We are building the first truly global studio fitness brand. We make fitness fun and effective. We use technology to inspire, guide, monitor and track progress. We have personality and express it creatively. Serious fitness need not be boring: it can be accessible, inviting, fun and life-changing.

Our team is comprised of fitness experts, brand builders, entrepreneurs, real estate legends, technologists and operations executives who have collectively built and grown dozens of successful businesses across a range of sectors.

Management Team

JoAnna Tuttle Bergfeld

JoAnna Tuttle Bergfeld is Fitwall's Director of Studio Operations. Most recently, Bergfeld was President of elements, a popular fitness and lifestyle brand for women. Prior to that, Bergfeld spent 25 years with 24 Hour Fitness where her business acumen helped expand six clubs to more than 420, creating one of the largest fitness brands in the country with $1.2 billion in gross market capitalization. Bergfeld was also the Chairman of the Helping Hands Grants Committee, an emergency relief organization set up for 24 Hour Fitness employees in need.

Clifton Harski

Clifton Harski is Fitwall's Director of Training & Global Head Coach. A lifelong athlete and collegiate basketball player, Clifton has been in the fitness industry for more than 8 years. He holds a degree in Kinesiology from SDSU. In just the last 3 years he has taught over 1,500 people while traveling the United States and conducting over 100 workshops covering different fitness systems for multiple companies, including his own. He is a student of human movement, and when introduced to Fitwall he immediately recognized the benefits people would have from this game-changing training system.

Joe Bergeron

Joe Bergeron is Fitwall's Chief Technology Officer. He is a tech guru who keeps Fitwall's operations and technology on track. Joe is an accomplished technologist who was nominated by MIT for the Technology Review 100, an award recognizing "the 100 most remarkable technology innovators under 35." He's directed the team of software architects that have created the platform that makes Fitwall's data-driven workout so powerful and unique. He's a graduate of Williams College with degrees in Economics and Computer Science.

Amy Harski

Amy Harski is Fitwall's Manager of Special Projects. Amy was a competitive gymnast in her youth and was a collegiate pole vaulter. Amy had been working one-on-one with clients for 4 years before joining Fitwall. She holds a degree in psychology from Clairemont Mckenna College and has multiple fitness certifications from her time in the field. She enjoys outdoor activities, salsa dancing, and showing boys up at the gym.

Rudy Thomas

Rudy is Fitwall's Director of Coach Education. He received his B.S. in Exercise and Sport Science from University of Wisconsin –La Crosse in 2001 and his M.S. in Exercise Physiology from Boise State University in 2004. Over the course of his 12 year career, Thomas has had the opportunity to work at prestigious universities such as Stanford, Boise State, Ohio State, South Florida, University of Iowa, Marquette University, and - most recently - as the head strength coach at the University of California –San Diego. Spending the better part of his career in the collegiate strength and conditioning arena provided him with key insights into training groups of individuals to become better athletes. Thomas maintains the following fitness credentials: CSCS, CSCCA, USAW, RKC, and the FMS.

Peter Giese

Peter Giese is Fitwall's Director of Studio Technology. After graduating with a degree in Electrical Engineering from UCSB, he worked in Southern California as a telecommunications engineer. In 2008, he founded Soekan Design, a Portland and Los Angeles based web development company. He has served as lead programmer, marketing consultant, and project manager in the launch of over 100 websites in dozens of industries. Combining his background in technology and project management, Peter manages Fitwall Studio hardware and software operations.

Board of Directors

Jeff Greenberg

Jeff Greenberg serves as Chairman of Fitwall’s Board. He is a private investor based in Manhattan Beach, California and serves as a Board Observer. He has been involved with two active lifestyle brands that have reached billion dollar valuations (Skechers and LA Gear). Jeff was a member of the founding team at Skechers, has held a range of roles, including SVP Active Electronic Media and COO, and currently serves on the board of Skechers USA Inc. (NYSE: SKX). He also serves as a director of Househappy, Inc.

Jake Silverstein

Jake Silverstein is a private investor and member of Fitwall's board. Jake leads Stormlight Expeditions, the Silverstein family’s private investment platform, and E'lir Capital, the family's early-stage investment vehicle focused on technology and consumer products. He holds an MBA from the University of Michigan, and received his BA in Mathematics at age 19. An avid reader and lifelong athlete, Jake is a member of the X-Prize Foundation Vision Circle, and a board member of the William James Foundation and Mama Hope (mamahope.org).

Anthony Westreich

Anthony Westreich is a founding Fitwall board member. He is an entrepreneur and business builder with a track record of success in real estate and beyond. Currently, he controls six million square feet of prime real estate in the New York and Washington, DC areas, including the historic Helmsley Building at 230 Park Avenue. Anthony is passionate about fitness, training on Fitwall and working out daily with his two sons as often as possible.

Corporate Advisory Board

Josh Weinstein

Josh Weinstein serves as a Strategic Advisor to the Board. He is a brand builder and entrepreneur who served as Fitwall’s founding CEO. Most recently, he founded and sold a solar development platform to a global solar developer. Josh started his career helping run the corporate synergy and special projects group at The Walt Disney Company, invested in and built companies at Brener International Group, worked in the Clinton White House and built a retail distribution platform for mobile content in Shanghai where he lived for 3 years. He's a graduate of Williams College.

Ethan Penner

Ethan Penner was a founding Fitwall board member. He is a legendary finance and real estate investor. A visionary entrepreneur, he transformed the fields of real estate and finance while at the helm of Nomura Asset Capital/Capital America. Ethan is committed to health and wellness. When not training on Fitwall, he and his wife Marisol can be found hanging out with their 5 children.

Rodney Goble

Rodney Goble is a Senior Advisor to Fitwall, as well as a franchisee focused on Michigan and the Midwest. He has a strong track record as an entrepreneur and developer. Most recently, Rodney built what became the largest physical therapy company in Michigan (56+ locations), which he sold to a private equity-backed platform. He is also the developer of the Legacy Center, a 100 acre multi-sport world-class training center, which is phase one of a larger 300 acre Legacy Park project. Rodney was Captain of the University of Michigan Baseball Team. He holds degrees in Exercise Physiology/Kinesiology, Health Science, as well as a Masters in Physical Therapy from the University of Michigan.

Shantanu Talapatra

Shantanu Talapatra is an advisor to Fitwall. Shan was an early employee at Zynga and the co-inventor of several gaming-related patents. He is a technologist, marketer and social media guru who understands how to build community online. Shan is an active angel investor and co-founder of Showvine. He is a graduate of the Georgia Institute of Technology.

Cyrus Walker

Cyrus Walker is a marketing and sales guru who was born and raised in Washington, DC. Most recently, Cyrus sold the global insurance brokerage he founded to publicly-traded NFP, a distributor of financial services to the affluent and their mid-tier corporations, which was originally financed by Apollo Partners. He's a serious athlete and talented golfer who has found lifelong friends and business partners on golf courses across the globe. Cyrus is a graduate of Colorado College.

Dr. Michael Mantell

Dr. Michael Mantell, a behavioral science coach for personal and organizational excellence, earned his Ph.D. degree at the University of Pennsylvania after completing his M.S. degree in clinical psychology at the Hahnemann Medical College, where he wrote his thesis on the psychology of obesity. He is the Senior Fitness Consultant for Behavioral Sciences for the American Council on Exercise, as well as an author, media spokesperson and national speaker. Dr. Mantell has taught for the Equinox Fitness Training Institute, has served as Chief Psychologist of Children's Hospital and Health Center of San Diego and for the San Diego Police Department. He has been a member of the clinical faculty at UCSD's Department of Psychiatry.

Joshua Zabar

Josh is an American entrepreneur, investor, advisor and thought leader in the health and wellness space. From 2010 to 2014 he was a Partner, Curator and on the Executive Committee at Summit, which is building a hub of culture, commerce, creativity, and thought leadership on a 10,000 acre parcel in Utah. Josh lives in Venice Beach, CA, arguably the global mecca for health-conscious individuals.

Athletic Advisory Board

Julius "Dr. J" Erving

Sports icon Julius "Dr. J" Erving is an advisor to Fitwall. Erving helped launch a modern style of basketball that emphasized leaping and play above the rim. He played on three championships teams, received four Most Valuable Player Awards and achieved three scoring titles with the ABA's Virginia Squires and New York Nets (now the NBA's Brooklyn Nets) as well as the NBA's Philadelphia 76ers. Erving retired as the third leading scorer in NBA/ABA history, and was renowned for his slam dunking from the free throw line in slam dunk contests. He is the only player voted Most Valuable Player in both the American Basketball Association and the National Basketball Association and was inducted into the Basketball Hall of Fame in 1993.

Peter Park

Peter Park, owner of Platinum Fitness in California and co-author of Foundation: Redefine Your Core, Conquer Back Pain, and Move with Confidence, serves as a personal trainer for many professional and amateur athletes. Park has also competed in collegiate volleyball as well as being a pro-triathlete and ultra runner. Between 1990-1995 he took home two World's Toughest Triathlon titles and five top ten finishes in Ironman competitions. He holds three Catalina 50 mile championship course records in ultra running and three nine trails championship course records, also in ultra running.

Mike Fitch

Mike Fitch is the founder of The Global Bodyweight Training System including Animal Flow. He has over 13 years of experience as a fitness professional, including as a personal trainer and with extensive fitness management experience. His development in the fitness field includes a range of fitness disciplines, fusing together training styles such as Olympic lifts, kettle bell training, sports-specific and speed-agility training, and specialized training for post-rehab and corrective exercise clients.

Dallas Hartwig

Dallas Hartwig is the founder of Whole9, a community focused on health, fitness, balance and sanity, all built on a foundation of real food and healthy nutritional habits. He earned a BS in Anatomy and Physiology and an MS in Physical Therapy from Andrews University, and has been a licensed physical therapist since 2001. He co-owned and operated a strength and conditioning facility with his wife Melissa until founding Whole9 in November 2009. He is a Certified Sports Nutritionist through the International Society of Sports Nutrition and an RKC-certified kettlebell instructor.

Jamie Guined

Jamie Guined, MEd, MBA, CSCS, FMS is Exercise Scientist at NASA Johnson Space Center. Jamie currently serves as Exercise Scientist in the Neuroscience Laboratory's Motion Lab at the NASA Johnson Space Center. An active member of the spaceflight community and industry, Jamie also serves as the Exercise Science adviser to Mars One, CapCom for the Mars Society's Mars Desert Research Station, and as Business Development Officer for Astronauts4Hire. Prior to joining the Neuroscience Laboratory, she worked with the Exercise Physiology & Countermeasures Project where she conducted physiologic, medical, and human performance testing and research of International Space Station & Space Shuttle crewmembers.

Marisol Teran Penner

Marisol Teran Penner is a member of Fitwall's founding team. She has a long track record in the athletic and fitness world, having achieved world-class status in both endurance sports as a professional triathlete and a cyclist as well as in strength sports as a champion bodybuilder and powerlifter. Marisol has also taught aerobics, competed as a synchronized swimmer, owned and managed gyms, been the trainer of many including numerous celebrities, and has many certifications including those from the Chek Institute as well as from Dragon Door as a Level 2 kettlebell instructor. Her sports career began very early as a student of Kyokushin karate beginning at the age of six. She was born in Caracas, Venezuela and has resided in Santiago, Chile as well before moving to the U.S. in 1992. She is devoted to living a fit and healthy life.

Fitwall Programming Committee

Clifton Harski

Clifton is Fitwall's Director of Training & Global Head Coach. Clifton has over 8 years of experience in the fitness industry in addition to holding a degree in Kinesiology from SDSU. From 2011 to 2014 he taught over 2,000 people and coaches and conducted over 100 workshops and certifications nationally; either through various companies or his own. He is a student of human movement, and when introduced to Fitwall he immediately recognized the benefits people would have from this game-changing training system. Clifton teaches certifications and serves as an advisor to Animal Flow and Kettlebell Athletics. He is also certified in DVRT, RKC, FMS, CK-FMS, Combine360, Ace Fitness, CrossFit, CF Football, CF Mobility, and Spartan Race SGX.

Rudy Thomas

Rudy is Fitwall's Director of Coach Education. He received his B.S. in Exercise and Sport Science from University of Wisconsin –La Crosse in 2001 and his M.S. in Exercise Physiology from Boise State University in 2004. Over the course of his 12 year career, Thomas has had the opportunity to work at prestigious universities such as Stanford, Boise State, Ohio State, South Florida, University of Iowa, Marquette University, and - most recently - as the head strength coach at the University of California –San Diego. Spending the better part of his career in the collegiate strength and conditioning arena provided him with key insights into training groups of individuals to become better athletes. Thomas maintains the following fitness credentials: CSCS, CSCCA, USAW, RKC, and the FMS.

Nicole Wallace

Nicole is a practicing Physical Therapist with the VA Healthcare System, San Diego, CA. Nicole graduated from Marquette University, earning her degree in Exercise Science and Doctorate of Physical Therapy. Nicole attended Marquette on a volleyball athletic scholarship and competed as a Division I athlete in the Big East Conference. Following her senior season, Wallace received the Cura Personalis Award for excellence in leadership through athletics, academics and service to others, as well as the Student Affairs Leadership Award for outstanding contributions to Recreation, Health and Wellness. While at Marquette, Wallace worked Nike SPARQ combines for football and basketball and aided in combine prep training. Nicole has furthered her education with continuing education courses in Dynamic Neuromuscular Stabilization (DNS), kinesio taping, REDCORD NEURAC training, Selective Functional Movement Assessment (SFMA), and Postural Restoration Institute (PRI).