"Leonard Clark was perhaps one of the greatest of all twentieth-century explorers. He did not believe in big expeditions and elaborate paraphernalia - he was a man who carried his own belongings and charged ahead. This same trait enabled him to perform extraordinary feats of military intelligence and reconnaissance in difficult and dangerous areas during World War II. Clark attended the University of California, then joined the army, attaining the rank of colonel. During the war, he spent many months in China behind Japanese lines organizing guerrilla activity. His post-war expeditions began in Borneo, and over the years he made trips to Mexico, the Celebes, Sumatra, China, India, Japan, Central America, South America, and Burma. He was the author of two other books, A Wanderer Till I Die and The Marching Wind. He passed away in 1957 at the age of 49, while on a diamond-mining expedition in Venezuela."
(1) Leonard Clark (c 1908-1957), Rivers Ran East, US Army intelligence officer and explorer of South America