See this PDF for a better picture of Tang, who experienced a stroke which has left him with balance, memory and epilepsy issues at age 37. He is on an anti-seizure medication that must be taken every 12 hours. You can also see his missing person's report here.

Tang is a 39 year old, 6'1" Asian man weighing 160 lbs. He was last seen wearing a blue jacket, blue jeans and brown shoes. If you have any information on his disappearance, please contact the SFPD Missing Person Unit at 415-558-5508.