Visiting history

• University of Southern California, Department of Mathematics Jan/10/2008-Feb/22/2008
• Århus University, Department of Mathematical Science Feb/6/2009-Mar/10/2009
• Michigan State University, Department of Mathematics Feb/1/2010-Mar/15/2010
• The Univerisity of Texas at Austin, Department of Mathematics Feb/1/2011-Mar/11/2011
• The Univerisity of Texas at Austin, Department of Mathematics Feb/28/2012-Mar/13/2012
• Simons Center, Mar/11/2013-Mar/17/2013
• Michigan State University, Department of Mathematics Mar/18/2013-Apr/1/2013
• KIAS, Mar/28/2016-Apr/2/2016

International workshops which I attended.

• Low Dimensional Topology (Berkeley US: August 11-15 2008)
• GÖKOVA GEOMETRY / TOPOLOGY CONFERENCES (Gokova Turkey: May 25-30, 2009)
• Spring School in Geometry and Quantum Topology (Les Diablerets: March 20-25, 2011)
• GÖKOVA GEOMETRY / TOPOLOGY CONFERENCES (Gokova Turkey: May 30- June 4, 2011)
• Workshop in Geometric Topology 几何拓扑研讨会 (Peking China: July 18th- July 21th, 2011)
• Workshop on Topics in Dehn Surgery (University of Texas at Austin: April 20-22, 2012)
• Geometry and topology of smooth 4-manifolds (Max Planck Institute for Mathematics, Bonn : June 3-June 7, 2013)
• Workshop and Conference on the Topology and Invariants of Smooth 4-Manifolds (University of Minnesota: July 31- August 10th, 2013)
• Workshop on Topology and Invariants of 4-Manifolds (Simons Center: August 22- August 27th, 2014)