Parker's impact on the style of fine wines has generated controversy. Parker is highly critical of "those who make 'industrial wines with little flavor and no authenticity'" and he believes that there are still undiscovered regions and wines that can successfully challenge the wine establishment. Critics such as Golo Weber claim that Parker likes less-acidic, riper wines with significant amounts of oak, alcohol, and extract. This supposed "Parker taste" may be less the result of Parker's own preferences than of a trend initiated by Émile Peynaud, the French oenologist and father of the so-called "international wines". In the 1970s, winemakers avoided the late harvests, when the grapes were mature, in order to avoid the risks of end-of-season rains. Peynaud proposed that winemakers should wait to harvest until the grape was fully mature, or even over-mature. He also insisted on control of malolactic fermentation through the use of stainless steel vessels.