Zachary Peter Gallen is an American professional baseball pitcher for the Arizona Diamondbacks of Major League Baseball (MLB). He played college baseball for the North Carolina Tar Heels for three seasons before being drafted by the St. Louis Cardinals in the third round of the 2016 MLB draft.

The Arizona Diamondbacks are an American professional baseball team based in Phoenix, Arizona. The Diamondbacks compete in Major League Baseball (MLB) as a member of the National League (NL) West Division. The franchise was established on March 9, 1995, and began play in 1998 as an expansion team. The team plays its home games at Chase Field. Along with the Tampa Bay Rays, the Diamondbacks are one of the newest teams in MLB and are the youngest team to win the World Series.