Team

Zoe Nikitas PA-C

November 16, 2025

Meet Zoe Nikitas, our board-certified Physician Assistant and passionate advocate for holistic and preventative health.

Dr. Cathy Koger 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. Koger graduated with a BSE in Mechanical Engineering from the University of Michigan and worked as an engineer for over 6 years at Raytheon Systems Company and IBM.

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

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, where he also competed on the Division I men's lacrosse team. He earned his MD from the Perelman School of Medicine at the University of Pennsylvania, where he was awarded the John R. Stanley Research Prize for Dermatology and the Alex's Lemonade Stand David M. Cohn Scholar Award. During his time at Penn, he led a student-run medical clinic serving homeless and underserved populations in West Philadelphia and completed a Research Fellowship in Dermatology Oncology & Dermatologic Surgery.

Dr. William C. Fix

February 15, 2025

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

December 1, 2024

Brenda Winski is a board-certified nurse practitioner, nationally certified by the American Academy of Nurse

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 Boulder, she worked at K2 Dermatology as a medical assistant prior to attending her Physician Assistant program.

Kirsten Revitte PA-C

August 3, 2024

Kirsten Revitte has been a Board Certified Physician Assistant since 2020 when she graduated from

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. Shannon then pursued a Masters's Degree and Physician Assistant Certification from Duke University in 2003.

Shannon Ross PA-C

June 3, 2024

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