I graduated with a doctoral degree from Peking University in January 2009. Postdoctoral fellow at UC Berkeley from January 2009 to December 2010. From January 2011 to January 2018, I worked in the Department of Probability and Statistics at the School of Mathematical Sciences at Peking University and the Center for Statistics at Peking University, during which I visited Harvard University for one year. I Joined the School of Public Health at Peking University in February 2018.