How does systemic risk arise? Where do fluctuations in aggregate economic activity originate? My research sits at the intersection of macroeconomics and finance, and seeks answers to these questions. I study co-movement in firm-level economic activity, and how co-movement at the firm level shapes systemic risk and aggregate fluctuations. My other research interests include technology adoption and abandonment, and bank-based versus market-based financial systems. I'm American, speak fluent German, and live with my British wife Nina in Seattle. Our cats are British too, their names are Teddy and Roo.