He has a lifetime record of 25-29 with a 3.36 ERA in six minor league seasons.
Gwaltney appeared in just three games with the Chicago Cubs' Arizona League team in 2006, going 0-1 with a 5.14 ERA in seven innings pitched.
In 2005, he appeared in one game at Double-A West Tennessee in the Cubs' organization after going 6-4 between Peoria and Dayton earlier in the season. He was 2-2 for Double-A Reading in 2004 in the Phillies system in four games. He also posted a 3.80 ERA for Clearwater in the Florida State League in 20 starts that year.
After being drafted in the sixth round by Philadelphia in 2002, he spent 2002 with Batavia in the NY-Penn League and split 2003 with Lakewood and the Phillies' Gulf Coast League team.
Gwaltney was 3-12 with a 4.05 ERA for Louisiana Tech in 2002. He currently resides in Willow Park, Texas.