Meet Our K2 Derm Team
At the heart of our practice is a team dedicated to collaboration, care, and expertise. Led by Dr. Koger, we bring unmatched dermatological knowledge and experience to every patient, ensuring personalized solutions designed to help you achieve healthy, radiant skin.
Boulder Strong, Boulder Proud
With deep roots in the Boulder community, we understand the unique challenges its high-altitude, dry mountain environment poses for your skin. Our team is committed to serving this vibrant community with cutting-edge technology, best-in-class equipment, and a genuine passion for skincare.
Whether you’re seeking advanced treatments or everyday care, let us guide you every step of the way. We’re here to help you achieve healthy, radiant skin—just like the natural beauty of Boulder.
Dr. Cathy Koger
Cathy Koger, D.O. is a board certified dermatologist and a fellow of the American Academy of Dermatology as well as a fellow of the American Osteopathic Board of Dermatology.
Dr. Kallgren’s love and enthusiasm for medicine and her patients convinced Dr. Koger to retire at an early age from engineering and pursue medical school. She was one of the first
Dr. William C. Fix
William C. Fix, M.D. is a board certified dermatologist and a fellow of the American Academy of Dermatology. Dr. Fix graduated from Brown University with BA degrees in economics and classics. He earned his MD from the Perelman School of Medicine at the University of Pennsylvania, where
Brenda Winski NP-C
Brenda Winski is a board-certified nurse practitioner, nationally certified by the American Academy of Nurse Practitioners (AANP) and licensed by the state of Colorado. Prior to becoming a nurse practitioner, Brenda was an emergency room nurse for 15 years. She has also had the privilege of working in family practice/internal
Kirsten Revitte PA-C
Kirsten Revitte has been a Board Certified Physician Assistant since 2020 when she graduated from Midwestern University in Glendale, AZ with a Master’s in Physician Assistant Studies. She attended the University of Colorado at Boulder where she earned her Bachelor’s in Integrative Physiology and English Literature. After graduating from CU
Shannon Ross PA-C
Shannon Ross is a board-certified Physician Assistant specializing in dermatology. Shannon earned her undergraduate degree from the University of Colorado, Boulder, where she graduated Summa Cum Laude with distinction. Check out Shannon’s suggested products: Shannon’s Derm Favs
