Vartan Gregorian, the philanthropist and Presidential Medal of Freedom recipient whose work revitalized the New York Public Library, died Thursday at age 87 while hospitalized for “testing related to stomach pain,” according to a statement by the Carnegie Corporation of New York.Vartan Gregorian, the philanthropist and Presidential Medal of Freedom recipient whose work revitalized the New York Public Library, died Thursday at age 87 while hospitalized for “testing related to stomach pain,” according to a statement by the Carnegie Corporation of New York.