Keller is a winery in Rheinhessen with a cult following, thanks to its Grand Cru-like dry Rieslings. The estate is owned and operated by the Keller family, and son Klaus-Peter is now in charge of day-to-day operations. Wine writer Jancis Robinson has called Keller Riesling “German Montrachets.” And Robert M. Parker Jr. has noted that over the past decade, “Klaus-Peter has brought the meticulous vineyard and cellar practices and overall ambition here to a fanatic level.”