Guy Steele comes to mind. He hasn't been as successful with the languages he co-created (most importantly scheme and to a lesser extent Common Lisp; Fortress was stillborn) but he's also been involved with the Javascript, C, Fortran (as a standards committee member) and Java (as a specification author). And he's been tremendously influential as a profound thinker on language design; I'm not sure anyone else understand so much about so many different languages and from quite different perspectives.

Hejlsberg probably is completely in a class of his own as a designer and architect/implementor of innovative spins on existing languages though.