From A Crack in the Edge of the World: America and the Great California Earthquake of 1906, page 408

“And, finally, among those who gave professional help, I must give enormous thanks to Ron Henggeler, whose peerless performance as a waiter at the Big Four Restaurant on Nob Hill is matched only by his talent as an artist and his infectious enthusiasm for collecting San Francisco memorabilia. Not a single aspect of Bay Area life – from the debates over the siting of wartime antiaircraft batteries to the menu choices for lunches served at the Sutro Baths, from the mating habits of sea lions to the casualty tolls from earlier earthquakes – has ever escaped Ron’s jackdawlike appetite, and his collections are immense and impeccably organized. He was kind enough to allow me to borrow from almost all and everything he possessed – film clips, books, magazines, paintings, vinyl records – and never once pressed me to return them until I was good and ready to do so. Ron is an enormously proud waiter, as he should be, and for anyone in need of some arcane fact about old San Francisco, I recommend a visit to his restaurant and a seat in his station. But do please remember the pourboire.