Mark Sobel, a former U.S. Treasury official, joined the Official Monetary and Financial Institutions Forum, or OMFIF, a thinktank that specializes in central banking and public finance. 

Sobel previously represented the U.S. on the International Monetary Fund board. He was with the U.S. Treasury department for 40 years.

OMFIF brought Sobel on as part of an expansion into U.S. policy.

"For decades Mark Sobel played a crucial role representing the US on international financial matters. His contributions to the G20 process helped chart a recovery from the financial crisis and Great Recession," said Jack Lew, the U.S. Treasury secretary from 2013-2017. "His engagement on issues ranging from financial regulation to exchange rate management and free trade strengthened international economic co-operation and stability. Representing the US at the IMF he continued that work."