 From 1935 onward, he served regularly as chair of the Fine Arts department.In 1929, Sachs became one of seven founding members of the Museum of Modern Art and gave it its first drawing, a George Grosz portrait of the artist's mother.During World War II, Sachs, along with disciple George L. Stout, was one of the people who developed plans to safeguard American works of art during the war, and one who set in motion the task force (later known as the Monuments Men) of American military officers who rescued European art and architecture during the war.