Paul Krugman is one of America's most well respected economists.
I consider economist Brad DeLong a centrist for various reasons (including his motto, Grasping Reality with Both Hands). OK, he's a partisan Democrat, but not a deep left winger like me. He worked in the triangulating Clinton Administration after all, alongside Larry Summers. On the Deficit Commission, however, he has had nothing good and lots of bad things to say about it.