Joseph Jarman the dojo-cho at Jikishinkan Dojo in Brooklyn is not only a Godan in Aikido, he is also a Zen priest and a world-renowned jazz musician.
Studying under him for the last five years I have seen how all of these various arts have blended together. His movements are fluid and have an impromptu edge I've rarely seen in other instructors. I really enjoyed working with him.
Anyway if anyone's interested here's a link that points to various bios on his life. Jarman