Wikipedia entry (retrieved 26 March 2017).
Digital source of illustration (retrieved 26 March 2017).
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Philip Lehman (1861-1947) was the son of Emanuel Lehman (1827-1907), the founder of the investment firm of Lehman Brothers, which went defunct in 2008. He started collecting art in 1911, and upon his death bequeathed the major part of his collection to his son, Robert Lehman (1891-1969).
Wikipedia entry (retrieved 26 March 2017).
Digital source of illustration (retrieved 26 March 2017).
WV