His research focuses on the interface between macroeconomics and labour economics. Recent work has examined the role of declines in wage growth among low-skilled workers on long term increases in joblessness in the U.S., the measurement of labour market flows in developed economies, the joint modeling of labour market flows over the business cycle and across firms, and the aggregate labour market effects of downward rigidity in wages. Prior to joining the University of Michigan he studied economics at the London School of Economics, culminating in a Ph.D. in 2005. He is an Associate of the Centre for Economic Performance at the LSE, and is a Faculty Research Fellow at the National Bureau of Economic Research.