David Stein, father of Tony-winning producer Joan Stein, died March 8 of natural causes at his home in Pembroke Pines, Fla. He was 79.Stein, whose daughter partners with Steve Martin in the Martin/Stein Co. at Carsey Werner Mandabach, was a decorated World War II officer. A successful businessman, he served as the VP of marketing and merchandising at E.J. Korvettes, an upscale discount store, for 20 years. He is survived by his wife, three daughters, a sister and three granddaughters.