Dr. MacGregor is a board-certified dermatologist and Fellow of the American Academy of Dermatology with experience in treating a wide array of skin disorders. He is a graduate of the University of California, Berkeley where he earned a B.A. in Integrative Biology. He attended medical school at Tulane University before performing his internship in Internal Medicine at California Pacific Medical Center. He completed his Dermatology Residency and served as Chief Resident at the University of California, Los Angeles. Dr. MacGregor is now in private practice in San Francisco, and is a Clinical Instructor at UCSF and teaches Internal Medicine trainees at the CPMC Family Health Clinic.
Dr. MacGregor practices medical dermatology and treats a variety of common skin conditions including skin cancer, psoriasis, acne and eczema. In addition to medical dermatology, Dr. MacGregor performs a variety of cosmetic treatments for his patients including Botox and filler injections, photorejuvenation with Intense Pulsed Light and lasers, anti-aging procedures with fractional resurfacing and Ultherapy, and treatment of leg veins with sclerotherapy.

Ms. Christina Tucker specializes in medical dermatology and has previous experience in gastroenterology and emergency medicine. She is a 2001 graduate of the Emory University School of Medicine Physician Assistant program after a master of science from Georgetown University and an undergraduate degree from Frostburg State University. In her free time she enjoys running, cycling, hula hooping and volunteering for the Haight Ashbury Free Clinics/Walden House. She is a long-term staff member here and our patients appreciate having people they can depend on to know them personally when they arrive.
Professional Societies:
American Academy of Physician Assistants
California Academy of Physician Assistants
Society for Dermatology Physician Assistants (Diplomate)
San Francisco Bay Area Physician Assistants
National Commission on Certification of Physician Assistants

Dr. Peng is double board certified in Dermatology and in Mohs Micrographic surgery. He received his B.A. from Cornell University and his M.D. from Jefferson Medical College in Philadelphia. After completing his dermatology residency at the University Hospitals of Cleveland where he served as Chief Resident, he completed a fellowship in Mohs Micrographic surgery at the University of California, San Francisco. Dr. Peng specializes in skin cancer surgery and is formally trained as a Mohs surgeon. Mohs surgery is an advanced technique for skin cancer treatment.