The Founders

Dr. Sasho MacKenzie, Co-Founder


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Golf’s foremost biomechanist, Dr. Sasho MacKenzie is the research practitioner behind the world’s top golf coaches - his work and theories have driven a scientific, evidence-based revolution in golf instruction and movement training.

Sasho’s area of expertise is the training and biomechanics of speed generation. The Stack System allows Sasho to share his research findings and training wisdom directly with you, using the same tools, techniques, and nuances that he uses to speed train Tour players he has consulted.

Sasho is an Engineering Consultant for PING and a Biomechanics Advisor and Software Developer for Footjoy.  He has published over 20 golf related research articles in scientific peer-reviewed journals and has been invited to speak to golf instructors for the PGA of Australia, Great Britain & Ireland, Spain, and the French Golf Federation. In 2018, Dr. MacKenzie was the Key Note speaker at the World Scientific Congress of Golf. He is a regular contributor to Golf Magazine and has been a featured guest on countless other golf podcasts, international radio shows, and television episodes.

In addition to golf, Sasho has worked with multiple MLB teams as a biomechanics/bat fitting consultant – including the 2020 World Series Champions L.A. Dodgers.

Dr. MacKenzie is a professor of Sports Biomechanics at St. Francis Xavier University in Antigonish, Nova Scotia where he also puts his expertise into action, having won back-to-back club championships in 2020 and 2021.

Marty Jertson, Co-Founder


Marty is a golf generalist, a PGA of America member, and in his 20th year as an engineer at PING.  Marty was the lead designer of the G30 and G410 drivers, co-inventor of the iPING Putting App, Ballnamic golf ball fitting tool (, PING Co-Pilot fitting software ( and is a named inventor on over 130 patents. 

Concurrent with his engineering career, Marty has taken his technical knowledge and training efficiency to the course.  He's played in 6 Major Championships, most recently the 2020 US Open at Winged Foot.  Marty made the cut in the 2019 PGA Championship at Bethpage Black and was a member of the 2011 and 2019 victorious PGA Cup Teams.  He has also played in the Waste Management Phoenix Open ('20) and the Shriners Hospitals for Children Open ('10, '11, '15, '16) along with 2 appearances at the TopGolf World Championship in Las Vegas.  Marty is also 4-time defending club champion at Wildfire Golf Club.

Marty’s passion is building solutions for golf's myriad of challenges.

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