New York Post by Page Six Team The Kelly Gang will toast its co-founder Ray Kelly at his last Kelly Gang luncheon as police commissioner Friday. The group will gather at The Four Seasons restaurant where author Tom Kelly, Post Media Ink columnist Keith J. Kelly, Jim Kelly of Vanity Fair, Ray’s son and “Good Day NY” co-host Greg Kelly, and Kelly Gang president Ed Kelly, whose day job is CEO of American Express Publishing, will send off the outgoing top cop. Xavier HS English t