I have been adopting the Benoni opening against 1 d4 recently with some moderate success. I would like to know whose games should I look at to have a good understanding. I see that Tal, and to a lesser extent Fischer, have practiced this opening in the past.
I would start with Vugar Gashimov and Veselin Topalov.
I agree with Evargalo; Topalov made some novel contributions. Even Kramnik popped out a Benoni in recent times. Three time US Champion Nick De Firmian played it a lot as well.
You might consider this book by Marian Petrov: "Grandmaster Repertoire 12: The Modern Benoni".