Are there GMs who play or have played this opening which I can study? Thanks.
Yes but it depends on what you mean by the Paulsen. I am going to assume you mean this:
There was a long thread about this last recently:
https://www.chess.com/forum/view/chess-openings/taimanov-paulsen-kan-sicilian-dispute-confusion
https://www.chess.com/article/view/the-paulsen-sicilian-a-history-part-2
GM Bryan Smith stated:
Currently the Paulsen retains its position as one of the top openings for grandmasters to use against weaker players in open tournaments. On the top level, its major exponents are Peter Svidler (who uses it almost constantly) and Gata Kamsky, while Fabiano Caruana also uses it frequently.
Are there GMs who play or have played this opening which I can study? Thanks.