The most visible Smalltalk at the moment/last 5 years and in my estimation what/the only thing that drives new users to come to Smalltalk is Pharo, and the person that is most responsible for that is Stephane Ducasse. I think his contribution to Smalltalk as a whole is underrated. The commercial Smalltalks exist only to server their legacy client base and others like Squeak and Dolphin are nice but are invisible.
The late and great James Robertson should not be forgotten. He promoted all Smalltalks with enthusiasm and expertise. I miss his podcasts. I have a soft spot for Dolphin. I agree with Richard O’Keefe about Dolphin. It is beautiful as well and well-esigned, and the creators Blair McGlashan and Andy Bower deserve some recognition for their work. Vince