Bisons baseball | Personnel baseball

Player rosters

Relief pitchers warming up, overseen by a bullpen coach. A manager will often have both a right-handed and a left-handed reliever warm up to maximize his strategic options.Squad or roster sizes differ between different leagues and different levels of organized play. Major League Baseball teams maintain 25-player active rosters. A typical 25-man roster in a league without the DH rule, such as MLB's National League, will feature:[91]

eight position players—catcher, four infielders, three outfielders—who play on a regular basis
five starting pitchers who constitute the team's pitching rotation or starting rotation
six relief pitchers, including one specialist closer, who constitute the team's bullpen (named after the off-field area where pitchers warm up)
one substitute or backup catcher
two backup infielders
two backup outfielders
one specialist pinch hitter, or a second backup catcher, or a seventh reliever

Other personnel
The manager, or head coach of a team, oversees the team's major strategic decisions, such as establishing the starting rotation, setting the batting order or lineup before each game, and making substitutions during games—in particular, bringing in relief pitchers. Managers are typically assisted by two or more coaches; they may have specialized responsibilities, such as working with players on hitting, fielding, pitching, or strength and conditioning. At most levels of organized play, two coaches are stationed on the field when the team is at bat: The first base coach and third base coach, occupying designated coaches' boxes just outside the foul lines, assist in the direction of baserunners when the ball is in play, and relay tactical signals from the manager to batters and runners during pauses in play.[92]

Any baseball game involves one or more umpires, who make rulings on the outcome of each play. At a minimum, one umpire will stand behind the catcher, to have a good view of the strike zone, and call balls and strikes. Additional umpires may be stationed near the other bases, thus making it easier to judge plays such as attempted force outs and tag outs. In Major League Baseball, four umpires are used for each game, one near each base. In the playoffs, six umpires are used: one at each base and two in the outfield along the foul lines.[93

source : wikipedia