Hi Colin, i suspected as much. Just so happened I was looking up Mitch myself, that's how I came by the answer and this *old* thread.
I had the pleasure of meeting Mitch and got to talking with him, back in September of 1988 @ EmpuriaBrava (CPCB), but it would be a miracle if he remembers me :-) OTOH I guess *anyone* who met Mitch (and Maria) will remember him!