By Liz Moyer Order Reprints Text size Gary Gensler, pictured here in 2012, has been nominated by President-elect Joe Biden to be chairman of the Securities and Exchange Commission. Alex Wong/Getty Images President-elect Joe Biden’s nominee to be Wall Street’s watchdog is returning to familiar ground. Gary Gensler, nominated to be chairman of the Securities and Exchange Commission, the campaign announced on Monday, is a former Goldman Sachs partner and Treasury Department official who led the Commodity Futures Trading Commission during President Barack Obama’s administration. At the CFTC, Gensler helped instill new discipline and rules for governing the multi-trillion-dollar derivatives market, including the 2010 Dodd Frank regulatory reforms enacted in response to the 2008 financial crisis.