Stuart R. Shamberg, 90, of New Rochelle, the founding partner of the Mount Kisco-based law firm of Shamberg Marwell Hollis Andreycak & Laidlaw, P.C., died Sunday, Jan. 1. Shamberg was born on April 4, 1926, in New Rochelle, where he grew up as the son of Herbert and Nita Shamberg. After graduating from New Rochelle High School in 1944, Shamberg joined the U.S. Navy and served in World War II.