"Cloyd P. Clevenger began flying gliders as a high school boy in Oakland, California. He was an instructor at March Field in the World War, then for the next forty years he had every kind of flying job imaginable: teacher and text writer, stunt man, skywriter, transport pilot in World War II. He flew in the 1927 and 1928 tours, retired a long time later in Mexico, died in 1964.." http://library.si.edu/donate/adopt-a-book/modern-flight
