In addition to posting fliers posted all over the city, they've created a wiki on the effort to find him, which is being constantly updated withinformatin on whom to contact if you can help, media links, news on the search activities, and a list of what has been done and needs to be done to find him.
Jerry Tang is Asian American, 6’-1”, 160 lbs, 39 years old, with black hair and brown eyes. He is prone to seizures, and is without his medication. It is possible that he is injured (possibilities include strokes or seizures, as well as the results of being out in the cold) and/or may have been taken in by homeless community. If you see him, call 911, (you will be asked, "Police, Fire, or Medical") say "Medical", identify yourself, state your location, and describe Jerry to them.