Winthrop, Stimson, Putnam & Roberts

It merged with San Francisco–based law firm Pillsbury, Madison & Sutro in 2001.

Du Bois,[4] America West Airlines,[5] Zapata Petroleum,[6] Clark Estates Inc.,[6] and Ethyl Corporation,[7] among others.

[8] Immediately prior to its 2001 merger, Winthrop had offices in Tokyo, London, Hong Kong, and Singapore with more than half of the firm's revenue coming from abroad.

[9] The 2001 merger with Pillsbury, Madison & Sutro, which was then twice the size of New York City-based Winthrop, Stimson, Putnam & Roberts, created one of the largest law firms in the country with more than 860 lawyers in 16 offices.

[11] The firm produced a number of leaders in law, jurisprudence and public service, including:

Felix Frankfurter , a U.S. Supreme Court justice, worked at the firm.