Stonyfield Farm CEO Gary Hirshberg, Beth Israel Deaconess Medical Center CEO Paul Levy, Boston Globe writer Scott Kirsner, Cape Wind CEO Jim Gordon and Northeastern University economist Barry Bluestone will be among speakers at the Progressive Business Leaders Network's 4th Annual CEO Summit to be held Friday, Oct. 8, from 7:45 a.m. to 4 p.m. at Bentley University in Waltham, Mass.The four major c...