He was a retired major from the United States Marine Corps. He is known
primarily as the author of a number of nonfiction books and articles
dealing with aerial phenomena. It was his conclusion that these
phenomena were interplanetary in origin. He became the famed Director
of The National Investigations Committee on Aerial Phenomena (NICAP).
Outside this subject, he wrote a biography of Charles A. Lindbergh
titled "Flying With Lindbergh."