Gray Kunz, the Swiss chef who grew up in Singapore, cooked in Hong Kong and broadened New York’s vision of fine dining in the 1990s at the luxurious Manhattan restaurant Lespinasse, died on Thursday in a hospital in Poughkeepsie, N.Y. He was 65.

The cause was a stroke, a representative for his family said. Mr. Kunz had homes in Brooklyn and Clinton Corners, in Dutchess County, N.Y.