A winemaker or vintner is a person engaged in winemaking. They are generally employed by wineries or wine companies, where their work includes: * Cooperating with viticulturists * Monitoring the maturity of grapes to ensure their quality and to determine the correct time for harvest * Crushing and pressing grapes * Monitoring the settling of juice and the fermentation of grape material * Filtering the wine to remove remaining solids * Testing the quality of wine by tasting * Placing filtered wine in casks or tanks for storage and maturation * Preparing plans for bottling wine once it has matured * Making sure that quality is maintained when the wine is bottled