Mark Walker is senior managing director at Guggenheim Securities, LLC. Previously, Walker was managing director and head of sovereign advisory at Millstein & Co. He was also managing director at Rothschild London from 2012 to 2014 and a senior advisor at Lazard Paris from 2011 to 2012. Walker was a partner at Cleary Gottlieb Steen and Hamilton LLP from 1975 to 2011 and the firm’s global managing partner from 2005 to 2011. He has advised the European Stability Mechanism, and countries including Colombia, Indonesia, Ivory Coast, Mexico, Peru, the Philippines, South Korea, the former Yugoslavia, and numerous others in Latin America, Asia, Europe, and Africa, on liability management including sovereign debt restructurings, infrastructure finance, and a wide variety of financial matters. During the 2008 financial crisis, Walker advised the U.S. Federal Reserve with respect to the bankruptcy of Lehman Brothers and programs developed to mediate the crisis. He holds a J.D. from Yale Law School and a B.A. in English literature from Stanford University.