Wine Spectator profiles four leading producers of California Rhônes: The Farm, a joint-venture between Argentinean vintner Santiago Achával and his wife Mercedes, and Americans Jim and Azmina Madsen; Favia, the husband-and-wife team of wine professionals Annie Favia and Andy Erickson; Keplinger, the namesake brand of renowned California winemaker Helen Keplinger; and Pruett, the winemaking enterprise of celebrated race car driver Scott Pruett and his family.