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."