Mark Sapiro is a longtime backpacker. He is also a rock climber and enthusiastic bicyclist. He has been leading Bay Chapter backcountry ski trips and assisting on Chapter backpack trips for more than 20 years. He has also assisted or co-led 11 Supported Trekking trips. Mark is a native of the Los Angeles area and has lived in the San Francisco Bay Area for more than 50 years. He was dean of computer services at City College of San Francisco until his retirement in 1992 (at a relatively young age).