NEW ORLEANS.- Arts philantropist Burton G. Tremaine Jr., 79, died. He was a business executive who managed his family’s art collection and philantropic foundation. Burton G. Tremaine Sr. and Emily Hall Tremaine, his father and stepmother, gathered an important 20th century art collection that included artists such as Picasso, Jasper Johns, Piet Mondrian, and Braque. From 1965 to 1985 he served on the board at the Wadsworth Atheneum Museum of Art in Hartford, and served as president there from 1978 to 1981. He became the first chairman of the Emily Hall Tremaine Foundation in 1991. It awards grants to support the arts and environmental issues and to raise public awareness about learning disabilities.