VIDEO: Sneak Peek at Jesse Tyler Ferguson on TLC's WHO DO YOU THINK YOU ARE?

Last summer's season of Who Do You Think You Are? led some of the world's most famous celebrities to make remarkable discoveries - from finding they were descended from European royalty to learning that their ancestors were involved in wars that changed the course of America. Throughout these journeys, they ultimately had a chance to make modern connections to the people in their lineage that were a part of history.

Click below to watch a clip of stage and screen actor Jesse Tyler Ferguson discovering his roots! Ferguson, who currently stars in ABC's MODERN FAMILY, has appeared on Broadway in On the Town and The 25th Annual Putnam County Spelling Bee, for which he and the rest of the cast won the 2005 Drama Desk Award for Outstanding Ensemble.

The Emmy-nominated series is back on TLC this summer with six all-new episodes and a brand new list of contributors. Executive Produced by Lisa Kudrow and Dan Bucatinsky, Who Do You Think You Are? continues to delve into the personal family histories of some of the most public names.

Coming up later this summer are fellow stage stars Kelsey Grammer and Cynthia Nixon. The series is produced for TLC by Shed Media US and Is or Isn't Entertainment. WHO DO YOU THINK YOU ARE? is based on an original format created by Wall to Wall Media and Alex Graham.