Dr. Hilde L. Sommerseth (prev. Jåstad) holds a doctoral dissertation from the University of Tromsø, titled: Northern Co-residence across Generations in Northernmost Norway during the Last Part of the Nineteenth Century. Her research centers on historical demography, with a focus on the late nineteenth and early twentieth century. Family history is the nucleus of her research, stretching from studies on infant mortality to research on household composition. Research interests: Family, aging, fertility, mortality, ethnicity, gender history.