sentences:  By that time, the foundation's collection included a broad spectrum of expressionist and surrealist works, including paintings by Paul Klee, Oskar Kokoschka and Joan Miró.After Guggenheim's death in 1949, members of the Guggenheim family who sat on the foundation's board of directors had personal and philosophical differences with Rebay, and in 1952 she resigned as director of the museum.Nevertheless, she left a portion of her personal collection to the foundation in her will, including works by Kandinsky, Klee, Alexander Calder, Albert Gleizes, Mondrian and Kurt Schwitters.