Dermatologist and public health advocate, died at 51. Dr. Cheung was born in Hong Kong and moved to New Jersey as a child. In medical school he started Columbia's first course on cultural diversity in medicine and was the first national president of the Asian Pacific American Medical Student Association. He completed a psoriasis research fellowship and served as co-chief resident of his dermatology program at Washington University in St. Louis before establishing a thriving solo dermatology practice in San Francisco. Dr. Cheung specialized in the care of patients with psoriasis and eczema, and his practice offered clinical trials and a photography unit. He served the indigent clinic at St. Mary's and established the teledermatology service for Asian Health Services. Dr. Cheung was president of the San Francisco Marin Medical Society, commissioner for the San Francisco Health Authority, and vice speaker of the California Medical Association House of Delegates. He played a pivotal role in initiating San Francisco's successful soda tax and a ban on flavored tobacco products. Photo of Dr. Cheung with family.