Trace the histories of these three guests. Tina Fey’s fifth great-grandfather survived a terrible massacre and became a hero in the Greek War of Independence. David Sedaris’ ancestors were also touched by the Greek War of Independence. George Stephanopoulos’ family was willing to sacrifice themselves in the struggle against the Nazi occupation of Greece during World War II.

A recent Maritz Poll reported that 60% of Americans are interested in their family history. And with good reason. Through genealogy, you can go back into history to meet people who have had more influence on your life than any others –– your ancestors. And the better you get to know your ancestors, the better you will get to know yourself: the who's and what's and why's of you.

Barbara Renick, a nationally–known lecturer on genealogy, tells

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Using DNA-analysis and traditional genealogical research, Henry Louis Gates, Jr. delves into the family histories and ethnic roots of celebrities from various fields.