In Squeak, each method is tagged with the author's initials. Here you can find who these guys are.
(For example, if you're looking at a method in the Squeak system browser, you can select 'versions' from the pop-up menu. This will show the initials of the person who wrote the latest version of that method.)
Please add yourself to this list if you ever contributed Squeak code to the public: change also your Who's Who entry then...