Kristen Holmes

WHOOP's VP of Performance Science and Principal Scientist

Kristen Holmes merges academic expertise with practical insights in athletics and coaching to pioneer breakthroughs in human physiology. Her research explores the intricate connections between sleep, circadian rhythms, recovery methods, and load management, empowering elite teams and professionals to optimize training using WHOOP data. Kristen's decorated athletic background and coaching success enhance her role as a beacon of innovation and excellence in performance science.

As Vice President of Performance Science and Principal Scientist, Kristen blends her academic and applied background in athletics, coaching, performance technology, psychology, and exercise physiology to drive research, partnership, and product development initiatives to strengthen WHOOP as a leader in Human Performance. Kristen's research is focused on understanding the effect of sleep, circadian, recovery, and load behaviors on our physical, mental, and emotional resilience. 

Additionally, Kristen works with hundreds of the best tactical, professional, surgical teams, corporate, and NCAA Athlete Teams in the world, helping them interpret WHOOP data to optimize training, recovery, and sleep and circadian behavior.  

Kristen was a 3x All American, 2x Big 10 Athlete of the year at the University of Iowa, competing in both Field Hockey and Basketball, and a 2021 University of Iowa Hall of Fame Inductee. 7-year member of the U.S. National Field Hockey Team and one of the most successful coaches in Ivy League history, having won 12 league titles in 13 seasons and a National Championship at Princeton University. 

Kristen has an MIT Sloan Artificial Intelligence Certificate, M.A. Psychology, and Sports Performance, B.A., Political Science, University of Iowa, Ph.D. Candidate, University of Queensland. Kristen serves as a Science Advisor to Levels Health, Science Advisor to Arena Labs, Advisor to Evolve Leadership, a Performance Ambassador to Liminal Collective, and sits on the Tactical Leadership Board of Sports Innovation Lab.

Dr. Belisa Vranich

Clinical psychologist, Author of Breathe: The Simple, Revolutionary 14-Day Program to Improve your Mental and Physical Health

Recognized as one of the top US doctors in her field by Dr. Oz, Dr. Belisa brings a wealth of knowledge and experience in the realms of breathing, mental health and fitness. She is the founder of “The Breathing Class’ and has authored numerous books on breathing, human health and physiology. She has wide-ranging and extensive experience working with firefighters, military and law enforcement officers for topics related to endurance, stress reduction, precision, pain reduction, and PTSD.

A clinical psychologist and a leading expert in mental health and fitness, Dr. Belisa Vranich is the author of Breathe: The Simple, Revolutionary 14-Day Program to Improve your Mental and Physical Health (St. Martin’s Press/Hay House) and Breathing for Warriors (St. Martin’s Essentials). She is the founder of

Dr. Belisa is a regular guest on national television; e.g., CNN, Fox News, the Today Show, Good Morning America, and Inside Edition, and has been interviewed by Anderson Cooper, Matt Lauer, Meredith Vieira, Bill O’Reilly, and Nancy Grace. Dr. Oz has recognized her as one of the top US doctors in her field. She has appeared as a guest on Cesar Millan’s show, Cesar 911, and has been a guest on podcasts with hosts Robb Wolfe, Ben Greenfield, Joey Diaz, and Dr. Mercola. In addition, Dr. Belisa has been interviewed as an expert in numerous publications, including Crain’s magazine, GQ, The New York Times, The Los Angeles Times, The Wall Street Journal, Vogue, Time Magazine, and Cosmopolitan.

Dr. Belisa has extensive experience working with first responders: firefighters, military and law enforcement for topics related to endurance, stress reduction, precision, pain reduction, and PTSD. A firm believer in the importance of giving back, she volunteers and supports numerous organizations related to veterans and animal rescue organizations in New York City and Los Angeles. Dr. Belisa is an outspoken advocate of organ donation and dedicated her first book to

Dr. Belisa was the former Director of Breathing Science at The Ash Center for Comprehensive Medicine in New York City, and has served as an advisor for the Fitness Institute for Gold’s Gym. She was previously the Health and Sex Editor at Men’s Fitness Magazine, an expert for Men’s Health, and Shape magazine, an advice columnist for the New York Daily News, and She was the Director of Public Education at the Mental Health Association of NYC; taught at New York University, was a consultant at the National Mental Health Association in Washington, DC; director of an outpatient clinic at Jacobi Hospital Center, Bronx, NY; a school psychologist in the South Bronx; and part of the Brooklyn Aids Task Force supporting parolees and their families.