<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Website </Td> </Tr> <P> Finding Your Roots with Henry Louis Gates Jr. is a documentary television series hosted by Dr. Henry Louis Gates Jr. that airs on PBS . In each episode, celebrities are presented with a "book of life" that is compiled with information researched by professional genealogists that allows them to view their ancestral histories, learn about familial connections, and discover secrets about their lineage . The series premiered on March 25, 2012 . Season four concluded airing on December 19, 2017 . </P> <P> The series uses traditional genealogical research and genetics to discover the family history of well - known Americans . Genetic techniques include Y - chromosome DNA, mitochondrial DNA, and autosomal DNA analyses to infer both ancient and recent genetic relationships . The series has examined the family histories of celebrity guests with African American, Asian American, British American, Chinese American, Dutch American, Greek American, Indian American, Irish American, Italian American, Jewish American, and Latin American heritage . </P>

Who is the host of finding your roots