Torah Personalities and the Times in Which They Lived
A set of 16 shiurim given by Rabbi Ron Yitzchak Eisenman, Rav of Congregation Ahavas Israel in Passaic, New Jersey. The shiurim range from Hillel to Rav Shimshon Raphael Hirsch. The first shiur is on the topic of "Why Study Jewish History?"
Also check out the Biographies and Genealogies at the Rabbinic Genealogy Special Interest Group site as well as their General Topics page that includes tools, databases and maps.