As one of the firm's senior most members, he has led a wide range of corporate turnarounds and large-scale business restructurings. Last June, he took on the major assignment of serving as General Motors Corp.'s chief restructuring officer as the company prepared to file the largest industrial bankruptcy in U.S. history. After filing for bankruptcy protection, General Motors completed a quick sale of its "good" assets to a new company, called General Motors Co. ("New GM"). Koch was then appointed CEO of Motors Liquidation Co. ("Old GM") and given responsibility for winding down the assets and liabilities of Old GM, which includes efforts to sell, liquidate or spin off the automaker's non-strategic assets. In 2002, Koch was appointed the interim chief financial officer of the Kmart Corp. when it filed for Chapter 11 bankruptcy.