The President and Chief Executive Officer of Fannie Mae, Michael J. Williams has announced his intention to resign. Williams, who has held the dual position since 2009 said late Tuesday that he will continue as CEO and as a director until a successor is named and then will leave the company. Williams joined Fannie Mae in 1991 , serving as head of the company's eCommerce and eBusiness divisions where he oversaw the development of the Desktop Underwriter product, a standard for the housing finance...