David Allan Aardsma is an American former professional baseball pitcher, currently serving in the Toronto Blue Jays front office as a coordinator of player development. He played in Major League Baseball (MLB) from 2004 to 2015 for the San Francisco Giants, Chicago Cubs, Chicago White Sox, Boston Red Sox, Seattle Mariners, New York Yankees, New York Mets, and Atlanta Braves. Aardsma is notable as the first player in alphabetical order among all of those who have ever played in MLB.