Doc Smith, aka Dr. Mark J. Smith

Meet Doc Smith

Dr. Mark J. Smith is a high-performance coach and a world-recognized expert on high-intensity interval training and Paleolithic nutrition. 

Working with passionate golfers, tennis and racquet sport players, and active people throughout Southern California, Doc Smith helps people with sports performance and nutrition and diet.

Doc Smith is a member of the Advisory Board of the Titleist Performance Institute and a TPI Certified Coach. He has been recognized three times by Golf Digest as one of the 50 Best Golf-Fitness Trainers in America. He is Chief Science Officer of The Paleo Diet and has helped people solve or ease health conditions using The Paleo Diet for over 30 years, making him one of the most experienced Paleolithic nutrition clinicians in the world. 

Doc Smith holds a doctorate in Physiology from Colorado State University, where he became the first graduate student to study Paleolithic nutrition under Dr. Loren Cordain, founder of the modern Paleo Diet movement, in 1990. He is a leading expert on supramaximal interval training. He holds a masters degree in Exercise and Sport Science, a bachelors in Physical Education and Sports Science and teaching certificates in Physical Education and Mathematics from Loughborough University. 

Doc Smith’s performance and nutrition clinic has been based in the Mission Hills Country Club near Palm Springs, California since 2006.

years clinical experience
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  • 3-time Golf Digest Golf-Fitness Trainer of the Year
  • Titleist Performance Institute Advisory Board Member
  • 20 Years’ Experience Coaching Golf and Racquet Sports Athletes

Work with the Professional Trainer the Pros Trust

Doc Smith Golf Digest Best Golf Fitness Trainer

Golf Digest Best Golf-Fitness Trainer
2019-2020

Golf Digest Best Golf-Fitness Trainer
2022-2023

Doc Smith Golf Digest Best Golf Fitness Trainer

Golf Digest Best Golf-Fitness Trainer
2025-2026

Doc Smith Titleist Performance Institute Certified Golf Fitness Trainer

Member of the TPI Advisory Board

At-a-Glance

Career Overview

1998: Started Paleolithic graduate studies with Dr. Loren Cordain

2006: Joined Mission Hills Country Club

2019: Became Chief Science Officer of The Paleo Diet

2024-2025: Coauthored Paleo for Life

Paleo for Life book

Golf sports image courtesy of: Pexels/jopwell.