Judging from the fellow researchers that I encountered during my few weeks at the Rockefeller Archive Center in the fall of 2010, it is clear that the Rockefellers -- through the university, their foundations, or the actions of the family -- impacted the twentieth century in a variety of disparate and seemingly unconnected ways. Many historians writing about the twentieth century can easily connect their work to some influential aspect related to the Rockefellers. For other researchers, the Rockefeller family and their institutions provide a rich contextual background for historical work in the twentieth century. I visited the RAC with the goal of the latter, but quickly found my research situated in the former category. As it turns out, the name "Rockefeller" has even found its way into the history of cloning.