found: Washington post WWW site, viewed Nov. 18, 2019(in obituary dated Nov. 15, 2019: Helen "Leni" Stern, a sculptor, art collector and philanthropist who helped found a museum of modern art that was instrumental in launching the careers of several major Washington artists, died Nov. 11 in the District [of Columbia]. She was 89. She moved to Washington in 1957, after marrying Philip M. Stern. In the late 1950s, Ms. Stern and two business partners operated a company that rented artwork to businesses and individuals. She was also a co-founder of the Washington Gallery of Modern Art, which opened in 1962. As a member of the museum's board and, for a time, its acting chairman, Ms. Stern helped establish a place for contemporary art in Washington. Ms. Stern was a pianist and painter before turning to sculpture. Helen Phillips Burroughs was born July 4, 1930, in Manchester, N.H.; marriage in 1950 to Henry Sedgwick. For many years, beginning in the mid-1970s, she maintained a home in Cuernavaca, Mexico. She was an art teacher and benefactor for a Mexican orphanage before returning permanently to Washington in the early 1990s)
