[2] He attended the U.S. Army Japanese Language School, located at the University of Michigan.
[3] Under Douglas MacArthur he became the head of censorship of the Army force occupying Hokkaido.
After he finished his military service, under the GI Bill, Henderson attended the Harvard Law School.
[4] Henderson authored and coauthored ten significant books related to Japanese law, and he wrote almost 100 articles and other works.
Daniel Harrington Foote, author of Law in Japan: A Turning Point, said "These works have had a tremendous impact on scholars and practitioners alike.