Former Medicare Chief Mark McClellan has accepted a new post as a visiting senior fellow with the AEI-Brookings Joint Center for Regulatory Studies in Washington. The new job will keep Dr. McClellan involved in health care policy issues. He also will remain as an associate professor of economics and an associate professor of medicine at Stanford (Calif.) University. Dr. McClellan had been on leave from Stanford for several years while working in the federal government. Before taking the post as administrator of the Centers for Medicare and Medicaid Services, Dr. McClellan served from 2002 to 2004 as the commissioner of the Food and Drug Administration. He also served as an economic and health care advisor to President Bush from 2001 to 2002.