Greg is a graduate of Quakertown High School, where he was named MVP of the baseball team during his junior and senior years, with a 1.70 ERA as a senior. He had an outstanding career at Lehigh University, striking out 103 batters, holding opponents to a .197 batting average as a sophomore and culminating his senior year with a 2-0 no-hit win over rival Lafayette. Greg hurled for the Blazers in 2007 and 2008 with a 6-1 record, striking out 64 batters in 73 innings pitched with a 2.81 ERA.