Nielsen Hayden genealogy



We are Patrick and Teresa Nielsen Hayden, a married couple of writers and editors in Tucson, Arizona. The database that starts at these two roots shows who we provisionally believe to be our (known) ancestors, plus collateral relatives and associated lines that interest us. This database also includes the ancestries of several friends and colleagues whose genealogy we're intermittently researching. As of February 2022, this site contains information on over 37,000 individuals, including over 400 direct ancestors of Patrick and over 10,000 direct ancestors of Teresa.

Everything here is based on at least one primary or secondary source, public or private, but all of it is subject to revision as new knowledge emerges. It is an absolute certainty that some things presented here will turn out to be wrong. All genealogy is a work in progress.

Click here for notes on a few of our sources; here for the Teresa Nielsen Hayden Medieval Ancestry Lists Page; and here for several thousand too many words about genealogical trivia.