We live in an era in which writers lament the end of expertise as a virtue and the president of the United States proudly eschews the nuances and details of his own policies, preferring to spend his days watching television. Nonetheless, elsewhere in the federal government each day, committed men and women from the three branches of government study, formulate, and execute public policy to serve a nation of 325 million people. Many of these men and women have the skills, intelligence, and education to thrive in private-sector enterprises—usually in more lucrative fields—yet instead commit to serving the nation’s greater good.