Genetic connections between Ashkenazic Jews and other Jewish populations, including Turkish Jews, Moroccan Jews, Tunisian Jews, Iranian Jews, and Cochin Jews, are indicated wherever they are known.

Each maternal haplogroup originated from a distinct woman who joined the Ashkenazic community. Some of these women were Judeans, some were Slavs, a few were Berbers, and several may have been Greeks—and those weren't their only origins.

Multiple Ashkenazic maternal and paternal haplogroups most likely came from Khazar and Alan converts to Judaism in medieval Khazaria. See the evidence on pages 7, 16-17, 52, and 85-86.

Two of the maternal haplogroups discussed in this book (H2a1e1a and U5a1d2b) were discovered to exist in Ashkenazim by the author and were not in any previous work about Ashkenazim.

Peer-reviewed by three professional historians and two professional geneticists. Includes bibliography (pages 183-200) and index.

Reviews:

"The book ... conveys to the citizen-scientist an encyclopedic reference combining a comprehensive wealth of DNA sequence signatures collated from seminal scientific publications and genealogy databases to trace shared maternal ancestral lineages of contemporary Ashkenazic Jews. A major attraction is the way in which Kevin Alan Brook couples the lineage moniker with carefully investigated community historical information. This allows the interested reader to fit his/her affiliation within the relevant demographic tapestry. The numerous upheavals that characterized the origins and history of Ashkenazic Jews are related to the catalogued DNA sequence patterns. Recent scientific reports of genomic DNA sequence data, including mitochondrial DNA from remains at a medieval Jewish burial site [in Erfurt, Germany], add further credence to the patterns elucidated in Kevin Alan Brook's tour de force."
      — Karl Skorecki, Professor and Dean of the Azrieli Faculty of Medicine, Bar-Ilan University, a co-author of many scientific papers on Jewish DNA including "The Genome-Wide Structure of the Jewish People" (2010) and "Counting the Founders: The Matrilineal Genetic Ancestry of the Jewish Diaspora" (2008)

"[A] most valuable resource for further reference regarding the Ashkenazi mitochondrial lineages."
      — Toomas Kivisild, Professor in the Department of Human Genetics and Head of the Laboratory for Human Evolutionary Genetics, Katholieke Universiteit Leuven, a co-author of multiple scientific papers on Jewish DNA including "The Matrilineal Ancestry of Ashkenazi Jewry: Portrait of a Recent Founder Event" (2006) and "Counting the Founders: The Matrilineal Genetic Ancestry of the Jewish Diaspora" (2008)

"I... found it very informative."
      — Peter B. Golden, Professor Emeritus of History, Rutgers University