I just checked their website to see if they had any updated information regarding their move but the site has not been updated. It still mentions Didier. Don't know if this is the same 'Mario' you're thinking.
Here is the information from their website.

http://www.mariosbistro.com/

"Mario trained in Québec City and became one of the youngest chefs to take a gourmet kitchen in his hands at Le Marie Clarisse. He then came to St Martin to be successively the chef at Chez Martine, Le Fish Pot and Rainbow, all of them located in Grand Case. The project of Mario's Bistro came right after. There, he adapted a concept of cuisine that suits the Caribbean and its cosmopolitan clientèle."

Ravi, thanks for the updates. <img src="http://www.traveltalkonline.com/forums/images/graemlins/thanks.gif" alt="" />