Von Hoffman was an explorer who once led a safari from Cape Town, South Africa, to Cairo—a walk that took him three years and was the basis of his two books, "Jungle Gods" (New York, H. Holt and Company ) and "Jerry on Safari: A 7,000 Mile Journey from Cairo to the Cape" (Philadelphia: J. B. Lippincott Company, 1936). Von Hoffman's photographs of the Mexican Revolution and of Theodore Roosevelt were celebrated; his photographs of Roosevelt and Pancho Villa were exhibited in 2002 at the Martin & Osa Johnson Safari