Dr. George Cotsarelis is the Milton Bixler Hartzell Professor of Dermatology and Chairman of the Department of Dermatology at the University of Pennsylvania Perelman School of Medicine. Dr. Cotsarelis is a world-renowned expert in hair follicle biology and stem cells. His research focuses on understanding hair follicle growth and regeneration, with the goal of developing new treatments for hair loss. He has made seminal discoveries identifying hair follicle stem cells and elucidating key molecular pathways in hair growth. As a physician-scientist, Dr. Cotsarelis maintains an active clinical practice focused on hair disorders. He has authored over 100 peer-reviewed publications and holds multiple patents related to hair biology and regenerative medicine.