Bachelor of Science in Chemical Engineering, Washington University, St. Louis, 1936. Vice president Midwest Cons. Inc., St. Louis, 1936-1948. Founder, Chairman of the Board Sigma Chemical Company, St. Louis, from 1948. Chairman of the Board, director Sigma-Aldrich Corporation, St. Louis, 1972-1982. Director Sigma-London Chemical Company.
Dan worked as a director in Sigma-London Chem in London, United Kingdom. He served to major at the Army of the United States from 1941 to 1945.
Dan was married to Roma Rosalyn Milder on October 30, 1949. Children: Joel Gary, Richard Allan, Melanie Susan, Marna Jeanne.