Kosiak has been deep in the weeds of the defense budget for most of his career, as a defense-budget analyst for think tanks, as a professor, and now at his post at OMB. He is responsible for putting together the president's annual budget request on defense spending. In other words, he helps to control the purse strings on the Defense Department's spending and tackles questions such as whether the United States should spend money on low-tech field equipment or massive weapons systems. These issues come at a time when money is tight throughout the federal government and when defense spending is meant to slow down, thanks to the drawdown of the wars in Iraq and Afghanistan. Kosiak prepped for this job for years, as vice president of budget studies at the Center for Strategic and Budgetary Assessments and as a senior analyst for the Center for Defense Information. He has authored studies on military manpower, modernizing the U.S. fighter, and the cost-effectiveness of space-based weapons. The 53-year-old Minnesotan has a law degree from Georgetown University and a master's degree from Princeton's Woodrow Wilson School of Public and International Affairs.