The DR is known very well for its ball players, but I am not sure that fits into your list of qualifications. Although I am sure Sammy Sosa wrote something down at some point in his life, he is better known and loved by his fellow Dominicans for how many homeruns he hits.
I am drawing a blank on names of Dominican intellectuals, and writers. Not to say that there aren't any, I just don't travel in circles that discuss this kind of thing.
There are several musicians on the island, and I know that at least one (some?) are known internationaly. The names escape me, perhaps someone else can list them for you. I think Criss travels in the same circles as Dominican intellectuals, musicians and writers, perhaps he can help out
Good luck with your research.
marc