Sidney J. Weinberg Jr., a senior director at Goldman Sachs & Co. and a member of the family central to the firm's modern history as an investment bank, died Monday of prostate cancer at age 87 in his home in Marion, Mass.

Born in Scarsdale, N.Y., he joined the New York firm in 1965 as a general partner and ran Goldman's investment banking division from 1978 to 1988. He became a limited partner in 1988 and a senior director in 1999, when the firm went public.

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