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09/07/2012 – Somerville, Mass. – Peter Walker, Director of the Feinstein International Center and Rosenberg Professor of Nutrition and Human Security, poses for a portrait outside the new Feinstein Center offices at 114 Curtis St., in Somerville on Sept. 7, 2012. (Kelvin Ma/Tufts University)09/07/2012 – Somerville, Mass. – Peter Walker, Director of the Feinstein International Center and Rosenberg Professor of Nutrition and Human Security, poses for a portrait outside the new Feinstein Center offices at 114 Curtis St., in Somerville on Sept. 7, 2012. (Kelvin Ma/Tufts University)