Alp Simsek is Rudi Dornbusch Career Development Associate Professor of Economics at Massachusetts Institute of Technology. He is also affiliated with the NBER and the CEPR. His research explores the connections between financial markets and the macroeconomy. Recently, he has written about asset price fluctuations and their implications for business cycles, macroprudential policy, and monetary policy. He has emphasized the role of financial speculation in driving asset price bubbles and crashes. He has also written about macroeconomic fragilities associated with debt and investment overhangs, international capital flows, financial networks, and complexity. His work has been published in leading scholarly journals, including Quarterly Journal of Economics, Econometrica, American Economic Review, Journal of Political Economy, Journal of Finance, and Journal of Financial Economics.