William C. Kohler, founder of Vantage sales and marketing, died April 30 in Ocean City, N.J. He was 76. Kohler was born in 1935; served in the U.S. Navy and U.S. Marines Corps from 1953 to 1956. Before founding Vantage sales and marketing in 1982, Kohler was sales director at Western Publishing an Grossett and Dunlap. He retired in 2001 and continued working as consultant from his home in Ocean City until earlier this year.