Jack Liebersohn is an Assistant Professor of economics at the University of California, Irvine, with a Ph.D. from MIT in 2018. He is an urban and financial economist. His work has examined the effects of mortgage rate lock-in on geographic mobility, evaluated the role of financial technology in shaping access to credit, measured the impact of banking mergers on deposit rates, and studied mortgage repayment behavior. He combines structural and reduced-form methods to study how financial frictions and regional mobility affect urban and regional outcomes. His email is liebersohn@gmail.com.