The 3,849-foot mountain encompassed some 6,788 acres when he and Bowerman, a botanist, formed Save Mount Diablo. Since then, the group has been instrumental in preserving 110,000 acres as open space in more than 40 parks in the East Bay. From the Contra Costa Times:
"He was a person who very early on saw Mount Diablo bigger than just a state park," said Robert Doyle, general manager for East Bay Regional Parks and a founding board member of Save Mount Diablo. "He saw all the foothills around as part of the mountain physically, and he didn't care who had them, he wanted them protected."Image of Art Bonwell in 2006: Bob Pepping/Contra Costa Times