Joannie Sun MD grew up in Bozeman, Montana enjoying skiing and hiking. She obtained a B.S. degree in biological sciences at Duke University, then attended medical school at the University of Washington. She completed a residency in Internal Medicine at the University of Washington. She decided to change specialties to Dermatology, which she completed at the University of California, Irvine. During her residency she also completed a clinical research fellowship in Dermatology, investigating studies in the treatment of psoriasis, actinic keratoses, cosmetic dermatology and atopic dermatitis.

She has worked full time in clinical dermatology in private practice since 2004 in Newport Beach, CA, specializing in general medical, surgical and aesthetic dermatology. Dr. Sun co-founded Advanced Dermatology of Orange County with Dr. Vu in 2007. She focuses primarily on medical dermatology specializing in care of skin cancer including performing Mohs microsurgery,as well as other general dermatology. She is interested in laser treatment for skin rejuvenation as well as treatment with Botox and fillers. She sees patients of all ages (including children) and enjoys the long term relationships that arise from seeing patients over many years. Dr. Sun has been a Fellow of the American Academy of Dermatology since starting clinical practice. In 2017 Dr. Sun was elected Best Dermatologist by the LA Times OC Times.

Dr. Sun is married, and has one son and one daughter. In her free time she enjoys cooking, exercise, playing the piano and travel.