Thanks to everyone for some great suggestions. I’m coming around to the notion that I asked the wrong question. In the context of Smalltalk’s 50th anniversary, the reason I asked the question is because I noted that in APL’s 50th anniversary celebration, they gave an award to the one individual who was deemed the greatest contributor to APL. So I thought I might do the same for Smalltalk.
But now, I’m seeing that was somewhat wrongheaded. Yes, it is the community that made Smalltalk what it was, and what it is today. Singling out one individual seems unfair, and rather arbitrary. Maybe I’ll conduct a poll with these suggestions and let the Smalltalk community express their support with their votes. That may even provide some insight.