An avid hiker, backpacker, and bicyclist since his teenage years, Bob, after retiring in 2003 from a teaching career at City College of San Francisco, has been volunteering in citizen science and trail building activities. In 2018, he formed the committee which led to the creation of the SF Crosstown Trail. Bob serves as a board member of both the Bay Area Ridge Trail Council and Sutro Stewards, performs scientific surveys for Beach Watch, monitors harbor seals for the Pt. Reyes National Seashore, and leads hikes for several organizations.