After his military service, Bannon worked at Goldman Sachs as an investment banker in the Mergers and Acquisitions Department.[34] In 1990, Bannon and several colleagues from Goldman Sachs launched Bannon & Co., a boutique investment bank specializing in media. Through Bannon & Co., Bannon negotiated the sale of Castle Rock Entertainment to Ted Turner. As payment, Bannon & Co. accepted a financial stake in five television shows, including Seinfeld.