Walker studies mortgage foreclosure, housing markets, and court systems. His research examines foreclosure litigation as a critical link between mortgage lending and housing precarity. By tracing the history of foreclosure during the subprime mortgage boom, he shows how the growth of high-risk lending led to new foreclosure strategies that deepened inequality. As market actors worked to manage their growing exposure to delinquency-related costs, foreclosure attorneys developed new litigation strategies that shifted risk onto struggling homeowners. Walker received his JD-PhD from the University of Wisconsin in 2024 and is currently a research fellow at the University at Buffalo Law School’s Baldy Center for Law and Social Policy.