Dr. Kristen Holmes is the Global Head of Human Performance and Principal Scientist at WHOOP, where she leads research and partnerships to optimize training, recovery, sleep, and resilience across sports, military, and healthcare. A psycho-physiologist, she focuses on sleep, circadian rhythms, and performance behaviors, helping individuals and teams in high-stress environments thrive. She also serves as a Science Advisor at Arena Labs and on the Medical Advisory Board at Levels.