Boston Magazine has selected a list of visionaries, idealists, and thinkers among us whose insights are transforming the way we live, work, learn, and play—not only here in Boston, but around the world. Joseph Betancourt, associate professor of medicine at Massachusetts General Hospital; Betsy Nabel, president of Brigham and Women’s Hospital; David Altshuler, professor of genetics at Massachusetts General Hospital; and Vivek Murthy, instructor in medicine at Brigham and Women’s Hospital, are included. Jay Bradner, assistant professor of medicine at the Dana-Farber Cancer Institute, and Geraldine Hamilton, senior staff scientist at the Wyss Institute, are cited under “The TEDx Effect.”