James M. Walker, M.D. spent 12 years at the Danville, Pa.-based Geisinger Health System. During that time, his title evolved from chief medical information officer to chief health information officer, to reflect the broad, multidisciplinary approach to clinical transformation that Walker and his colleagues at Geisinger have striven for. What’s more, Walker continued to practice medicine part-time, until November 2010 (his clinical specialty was internal medicine).

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