My martial arts Grandmaster. Last I heard he is pretty much retired other than lectures and a few demos (he is pushing 100 years old). He returned to Korea some time ago.
He taught me much more than the Arts… he taught me philosophy and a form of spirituality (actually, part of the Arts). And he furthered my self control which, as a hot blooded lad, I so needed (yet another part of the Arts).
He also taught me that being sometimes semi paralyzed in one side of his body (getting worse over the years) due to shrapnel from the Korean war did not slow him down. He was also blind in one eye from the war. The shrapnel was too close to his spine to be removed.