Andrew G. Biggs
Biggs is a researcher at the Cato Institute, a Washington, D.C., Libertarian think tank. Biggs "has been an outspoken proponent of converting Social Security benefits into self-directed retirement accounts, which Bush favors but Democrats have stopped cold. Bush nominated Biggs to that post in November , but the process stalled in February when the Senate Finance Committee refused to hold confirmation hearings because of his views on privatization." 
- Joel Havemann, "With Senate on break, Bush appoints officials. The three, including a contentious regulatory director, most likely would not have been approved by lawmakers," Los Angeles Times, April 5, 2007.