Mark McClellan is resigning his post as head of the Centers for Medicare and Medicaid Services. After implementing the Medicare prescription drug benefit, McClellan, who served as FDA commissioner for two years before taking his current post in 2004, said he wanted to spend more time with his family and told the Associated Press that he might take his health policy expertise to a think tank. In an email to agency employees on Sept. 5, he wrote: “This was a hard decision, because this is the most exciting and rewarding place that anyone could ever work. But I’ve been in government service for much longer than my family and I had ever expected or prepared for, and after almost six years in this Administration plus service in the previous Administration as well, I’m looking forward to more dinners at home with Steph and our daughters.”