He is an expert and investor in the community banking industry and is often quoted in ABA Banking Journal and other financial media. In addition, he speaks frequently at industry events, including those hosted by the American Bankers Association, Conference of State Bank Supervisors, FDIC, Federal Reserve Bank, and SNL Financial. He also serves as Adjunct Professor at the Columbia Business School in New York City.
Prior to co-founding StoneCastle Partners, Siegel was a co-founder and vice-president of the Global Portfolio Solutions Group at Salomon Brothers/Citigroup Global Markets, a group organized to finance portfolios of financial assets for corporations and to invest in the sector as a principal. He later assumed responsibility for developing new products, including pooled investment strategies for the community banking sector.