His IMDb page states that he started on Broadway in 1975 with a role in The Wiz as the show's Lion. Ken continued making a name for himself in theatre in a role as Old Deuteronomy

Ken Page, one of Broadway’s most familiar character actors who indelibly lent his voice to Tim Burton’s holiday film classic The Nightmare Before Christmas as the villainous Oogie Boogie, died Monday,

His career on Broadway spanned decades. But he has probably best known for providing the voice of the boogeyman in “The Nightmare Before Christmas.”