Influential wine critic Robert Parker surprised Napa Valley vintners in February when he handed over his California reviews to Antonio Galloni, who plans to shake things up. “I’m convinced there are a lot of young producers who are under the radar, and I’m looking to discover them,” Galloni said in an interview. “I don’t know if people will be enthusiastic, but I know change is tough.” No critic has helped elevate California wines more than Parker, 63.