Aristeo Martinez is the Cellar Master for Keenan Winery. âArtâ has been a member of the Keenan Team since 2003 and is a recognized âjack of all trades.â He can usually be found at the heart of the Winemaking process âracking barrels, assisting with harvest and crush, driving the forklift, unloading bins, and providing support in the transfer of wine to barrels, following fermentation. He is a big fan of Keenan Merlot and Cabernet Franc. Originally from Michoacán, Mexico, Art and his wife Maria live in the Napa Valley with their daughter Angela.