Like the rest of PD departments, MLB staffs are expanding: at the start of 2019, the thirty teams listed a combined eighty major-league coaches other than the previously standard six (bench coach, hitting and pitching coaches, first- and third-base coaches, and bullpen coach), including twenty-five assistant hitting coaches, six assistant pitching coaches, and several dedicated catching and/or quality control coaches. (Some teams, including the Dodgers, White Sox, and Angels—who’ve hired several cutting-edge coaches who’d gained attention on Twitter—employ three hitting coaches.)
