Sommer has experience in the Chicago Cubs organization, where he spent his entire career before joining the Patriots.
Sommer spent most of the 2010 season in Double-A and was promoted to the Triple-A level, where he appeared in seven games.
He finished with a 2.13 ERA, while striking out 67 in 72 innings pitched for Daytona in 2009.
In 2008, he spent time in Boise of the Northwest League, finishing the year with a combined 4-2 record and 30 strikeouts in 39.1 innings pitched.
Sommer has a career 9-8 record with a 2.27 ERA and 139 strikeouts in 179 innings pitched.