How to Coach a Macros-Based Diet

Krista Scott-Dixon is Precision Nutrition’s director of curriculum. She earned her doctorate in Women’s Studies from York University. She holds counseling certifications from George Brown College and Leading Edge Training, which is certified by the Canadian Psychological Association.

Brian St. Pierre is the director of nutrition at Precision Nutrition, the coauthor of Precision Nutrition’s Level 1 Certification textbook, The Essentials of Nutrition and Coaching, and the mastermind behind the Precision Nutrition Calculator. He holds a master’s degree in Food Science and Human Nutrition from the University of Maine.

Adam Feit is Precision Nutrition’s head strength and sport psychology coach. Feit earned his master’s degree in Exercise Science and Health Promotion from the California University of Pennsylvania and a bachelor’s degree in Applied Exercise Science from Springfield College. He recently received his PhD in Sport and Exercise Psychology from Springfield College where he examined the use of mental skills in collegiate strength and conditioning.

Helen Kollias, PhD, is PN’s science advisor and coauthor of Precision Nutrition’s Level 1 Certification textbook, The Essentials of Nutrition and Coaching. An exercise physiologist, Dr. Kollias earned her doctorate in Molecular Biology from York University in Toronto, specializing in the area of muscle development and regeneration. She has a master’s degree in Exercise Physiology and Biochemistry from the University of Waterloo, and has taught exercise physiology, molecular biology, and biochemistry at the university and college level.

Craig Weller is Precision Nutrition’s exercise systems and program director and a PN Master Coach. His certifications include US Navy SWCC (Special Warfare Combatant Crewman), Department of State WPPS-2 (Worldwide Personal Protective Service), Certified Personal Trainer (CPT) through the National Strength and Conditioning Association, StrongFirst Girya Level 1, and Precision Nutrition Level 2. He’s also a US Department of State Worldwide Personal Protective Service Security Specialist and formerly a nationally-registered emergency medical technician.

Karin is a Curriculum Writer with a PhD focused on health behavior change. In addition to that, she has a M.A. in Communications, a Bachelor's in Psychology, and she has published research on Mindset Theory.

Alexander Schwartz, PhD, is a nutrition scientist and curriculum designer with Precision Nutrition. Dr. Schwartz earned his PhD in Nutritional Sciences in the area of testosterone, appetite regulation and exercise physiology. His master’s of science degree in Human Kinetics focused on energy expenditure, weight loss and obesity and he has been heavily cited on the subject.

Dr. Ezinne Meribe is a Research Scientist and Curriculum Writer at Precision Nutrition. She obtained her bachelor's degree in Medicine & Surgery from University of Nigeria Nsukka. She has a Masters degree in Public Health from Kumamoto University, Japan where she is currently enrolled as a PhD candidate. The core of her work is built on using client centered communication to improve health outcomes.

Ryan Andrews is a principle nutritionist and adviser for Precision Nutrition and an adjunct instructor at Purchase College, State University of New York. He holds master’s degrees in both Nutrition and Exercise Physiology from Kent State University and a BS in Exercise Science from the University of Northern Colorado. Ryan completed his dietetic internship at Johns Hopkins Medicine and studied sustainable food systems at Columbia University in the executive education program.

Dr. Marge Garrod is a retired clinical researcher with a PhD in Nutritional Biology and Masters in Pharmacology/Toxicology, who worked mostly on human nutritional absorption and metabolism studies both through UC Davis and the ARS-USDA Western Human Nutrition Research Center at Davis.

Carlos Davila, M.A. Developmental Psychology, is an Adjunct Professor at LIU Brooklyn (where he teaches Sports Psychology at the undergraduate and graduate level) and at John Jay College (where he teaches Intro to Psychology). He’s also a CrossFit coach and group exercise instructor at Fhitting Room.

Laura Castellani is a post-doctoral fellow at the Centre for Addiction and Mental Health (CAMH) in Toronto. Her research focuses on understanding the metabolic implications of antipsychotics, and how exercise and nutrition can restore metabolic and mental health. Prior to joining CAMH, Laura completed her PhD in Exercise Physiology & Metabolism, her MSc in Human Health and Nutritional Science, and a BSc in Biological Science, all at the University of Guelph, Ontario.

Elnaz is a researcher and writer for Precision Nutrition. She holds an HBSc in Biology and Psychology and completed her PhD degree in Kinesiology and Health Science at York University. Elnaz is also a Precision Nutrition Level 1 certified coach and a registered holistic nutritionist through the Canadian School of Natural Nutrition.