Donald "Don" Berwick, CMS Administrator

Donald "Don" Berwick, CMS Administrator

Joshua Roberts/Bloomberg

Donald "Don" Berwick, administrator of the Centers for Medicare and Medicaid Services, testifies to the Senate Finance Committee in Washington, D.C., U.S., on Wednesday, Nov. 17, 2010. Berwick, in his first appearance before Congress since his appointment, told critics of President Barack Obama's health-care overhaul that the law will improve care.