His best known film role was as Anne Hathaway's friend Doug in the 2006 film The Devil Wears Prada. He has appeared in commercials for companies such as Nextel, Sprint and Bud Light. In 2007, he appeared in an episode of Law & Order. Sommer has a regular supporting role on AMC's television series Mad Men, as Harry Crane, a media buyer who becomes head of the television department in a 1960s Madison Avenue ad agency. He can be seen in ImprovEverywhere's viral video "Frozen Grand Central". On September 25, 2008, Sommer appeared as a guest star on the television series The Office.
Sommer was born in Toledo, Ohio and raised in Stillwater, Minnesota. He attended Concordia College in Moorhead, Minnesota, where he majored in theater and sang in the The Concordia Choir. He studied improv work at the Brave New Workshop in Minneapolis and started an improv group, the Slush Puppies, in Moorhead. He received his MFA in acting from Case Western Reserve University in Cleveland, Ohio. Sommer returned to the school in 2006 to teach icebreakers to law students, and again in 2008 to do an improv workshop with undergraduate theatre students.
He lives in Los Angeles with his family. He and his wife Virginia have a daughter, Beatrice (born 2008), and a son, Patrick Ryan (born August 31, 2010). He maintains a blog at Vox, which he began using as a beta tester.. He is a keen board gamer.
- Death 4 Told (2004)
- The Devil Wears Prada (2006)
- Mad Men (2007–2015)
- Pose Down (2007)
- Ugly Betty (2010, guest appearance as Jimmy)