Stephen A. Haller is the Park Historian and Branch Chief for Cultural Resources at Golden Gate National Recreation Area. Formerly the Curator of Historic Documents for the San Francisco Maritime National Historical Park, he has also been an interpreter at a number of historic San Francisco Bay Area sites, including Alcatraz, Fort Point, and the Maritime Museum. Haller's academic background is in nineteenth century American history; he specializes in the study of shipwrecks, military history, and historic landscapes in the Bay Area.
John A. Martini is a native Californian and a life-long researcher into the history of the American West. A fourth-generation San Franciscan, Martini worked as a National Park Service Ranger for more than twenty-five years at such diverse locations as Fort Point National Historic Site, Alcatraz Island, the National Maritime Museum, the U.S.S. Arizona National Memorial, the Presidio of San Francisco, and Sagamore Hill National Historic Site. He retired from the National Park Service in 1999 and now serves as a professional researcher and historical consultant. Martini's specialty is historic preservation and interpretation. He is an acknowledged expert on America's coastal defenses and consults with numerous state and federal agencies on the restoration of seacoast fortifications and artillery pieces.