Gallen is an assistant professor at the University of Chicago Harris School of Public Policy. She received a PhD in economics from Northwestern University in 2016. She is a labor economist studying the gender wage gap. Her research focuses on understanding the sources of the gender pay gap---preferences, discrimination, or productivity? She is also interested in the impact of family friendly policies on the labor market, particularly looking at indirect or unanticipated effects of policy reforms. Many of her projects use Danish register data linking workers and firms. Her current work focuses on the savings and career decisions of household before they know their preferences concerning child-rearing.