Warburg Dillon Read was an investment bank created by the Swiss Bank Corporation ("SBC"

, following its 1997 acquisition of S. G. Warburg & Co. which it merged with Dillon, Read & Co., a firm it had acquired in 1995. SBC itself merged with the Union Bank of Switzerland in 1998, creating UBS AG. Warburg Dillon Read was subsequently renamed UBS Warburg and eventually just UBS Investment Bank.
http://en.wikipedia.org/wiki/Warburg_Dillon_Read
The firm traces its history to 1939, when Eric Warburg of the Warburg banking family founded a company under the name E.M. Warburg & Co. Its first address was 52 William Street, New York, the Kuhn Loeb building. Throughout the early post-war period, the firm remained a small office of not more than 20 employees. In 1966, E.M. Warburg merged with Lionel I. Pincus & Co, forming a new company that eventually became known as E.M. Warburg, Pincus & Co.[5] In 1965, when Eric Warburg retired to Germany, control was handed to Lionel Pincus, a partner in the Ladenburg Thalmann investment bank, and the working language of the office switched from German to English. Lionel ran the company from 1966 to 2002, and died in 2009. [6]
During the post-war period, Eric Warburg vied with his cousin Siegmund Warburg, founder of S.G. Warburg, over the use of the Warburg name in New York. Siegmund wished to expand the S.G. Warburg franchise into New York but was blocked by the existence of E.M. Warburg & Co. Following the effective sale of the business to Pincus, Siegmund Warburg accused Eric of prostituting the Warburg name. "Complicating matters was that Siegmund thought Pincus the wrong kind of Jew - of Eastern European ancestry, with a garment-district background. Professionally, he thought Pincus well below haute banque stature in the venture capital world."[18]
http://en.wikipedia.org/wiki/Warburg_Pincus