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Gerald Dempsey Posey III, known as Buster Posey, is an American professional baseball catcher who played 12 seasons in Major League Baseball (MLB). He played his entire career with the San Francisco Giants, winning three World Series championships (2010, 2012, and 2014) and the National League Most Valuable Player Award in 2012. Posey is widely regarded as one of the greatest catchers in MLB history.