I've got to say I've been reading Carrolls articles on ESPN and have been impressed. I am a little familiar with his "under the knifle" articles at Baseball Prospectus but am curious as to his knowledge about football injuries. He's posted positive comments about Portis and a somewhat lukewarm review of Steve Smith's injury. Anybody know what his background and credentials are? It is interesting reading and is becoming one of my favorite weekly articles to read.