John A. “Jack” Zduriencik (pronounced /zɜrˈɛnsɪk/; born January 11, 1951 in New Castle, PA) is the General Manager of Major League Baseball's Seattle Mariners. He has developed a reputation as a baseball executive who excels in finding, drafting, and developing talented young ballplayers.
Jack Zduriencik began his career in professional baseball as a second baseman in the Chicago White Sox farm system. From 1973 to 1974, he spent time playing for both the Gulf Coast White Sox and the Appleton Foxes.
Following his playing career, Jack spent several years as a coach for both baseball and football. His coaching tour included stops at Austin Peay State University (1975-77), Clairton High School (PA, 1977-80), and Tarpon Springs High School (FL, 1980-82).