Frequently cast by director Warren Beatty.
Has a masters' degree in English from the University of North Carolina, and trained at the famed Actors Studio in New York.
Profiled in "Names You Never Remember, With Faces You Never Forget" by Justin Humphreys (BearManor Media).
Was credited as R. K. Armstrong in the English-language version of My Name is Nobody (1973) (My Name is Nobody).