After graduation from Stockholm University, Winroth did his master's and doctoral studies at Columbia University under Robert Somerville, followed by postdoctoral research at the University of Newcastle, where he was the Sir James Knott Research Fellow and worked with R. I.

"[1] He worked on the Decretum Gratiani of Gratian and discovered that the original version, the so-called "first recension," was only about half the size of the commonly known text.

Winroth also has a strong interest in Swedish genealogy.

She works for the National Library of Norway and is known for her scholarship on women in the Viking world.

This biographical article about a Swedish historian is a stub.