Invited Talks (selected)

1. Connections between ramified optimal transportation and p-harmonic maps on weighted graphs, Workshop on optimal transportation, Banff, Canada,
   April 2010.
2. Ramified optimal transportation in geodesic metric spaces, Analysis and Geometry Seminar, Rice University, January, 2010.
3. Ramified optimal transportation in geodesic metric spaces,  IPAM reunion conference of optimal transportation workshop, Lake Arrowhead,
   December, 2009.
4. Diffusion limited aggregation driven by optimal transportation, Workshop on optimal transport, Los Alamos National Laboratory, Santa Fe, NW, Oct 2009.
5. Ramified optimal transportation and its applications, Geometry Seminar, Stanford University, March, 2009.
6. Ramified optimal transportation and its applications, PDE seminar, Georgia Tech, Feb, 2009.
7. An introduction to ramified optimal transportation and its applications, Applied math and PDE seminar, UC Davis, October, 2008.
8. Optimal transport paths between probability measures, and beyond. UC Irvine, May 2008.
9. Optimal transport paths and their applications, Workshop on "Optimal transportation", held in IPAM, March and April, 2008.
10. Geodesics between probabilty measures and the dimensional distance. Workshop on “Shape Analysis for Eigenvalues”, held in Mathematisches Forschungsingstitut Oberwolfach, Germany (April 2007).
11. A mathematical theory of ramified transportation. Workshop at the Institute for Pure and Applied Mathematics, UCLA, (April 2007).
12. A mathematical theory of ramified transportation. University of Science and Technology of China, September 2006.
13. A mathematical theory of ramified transportation. Shanghai Jiaotong University, China, September 2006.
14. A mathematical theory of ramified transportation. Rice University, August 2006.
15. On the formation of tree leaves. Workshop on “Calculus of Variations”, held in Mathematisches Forschungsingstitut Oberwolfach, Germany (July 2006).
16. Ramified mass transportation and its applications. AMS sectional meeting. San Francisco (April 2006). Co-organizer with Steve Schkoller.
17. A variational problem arises from mud cracking. UC Davis, March 2006. 
18. Ramified mass transportation and the formation of tree leaves. AMS sectional meeting. Lincoln, NE (October 2005).
19. The formation of mud cracking. AMS sectional meeting. Bowling Green, KY (March 2005) 
20. Ramified phenomena in optimal transportation. University of Colorado at Boulder, January 2005
21. On the formation of tree leaves. University of British Columbia, Vancouver, Canada. January 2005.
22. Ramified phenomena in optimal transportation. University of British Columbia, Vancouver, Canada. January 2005
23. Ramified phenomena in optimal transportation. University of California at Davis, January 2005
24. Ramified phenomena in optimal transportation. University of Utah, January 2005
25. The formation of tree leaves.   SIAM Conference on Analysis of Partial Differential Equations (PD04).  In the minisymposium "Some Variational Problems from Biology". Houston, Texas, December 2004.
26. Optimal transport paths and beyond.  SIAM Conference on Analysis of Partial Differential Equations (PD04).  In the minisymposium "Free boundary problems and optimal transportation." Houston, Texas.  December 2004
27. The formation of a tree leaf. AMS Southeastern Section Meeting, Nashville, TN, October 2004.
28. The formation of tree leaves. AIMS's fifth international conference on dynamical systems and differential equations. Special session on "Mathematics Inspired by Biology". Pomona, CA, June 2004.
29. The formation of tree leaves. The sixth AMS-SMM meeting in Houston, 2004.
30. Optimal paths related to transport problems. Workshop on mass transportation at Scuola Normale Superiore, Pisa, Italy, October 2003.
31. Variational problems in the intersection homology theory of singular varieties, ANA conference at Carnegie Mellon University, May 2003.
32. Regularity of optimal paths related to transport problems, PIMS at University of British Columbia, July 2002. 
33. Soap films in singular spaces, University of Texas at Austin, October 2002.
34. Optimal paths related to transport problems, University of Wisconsin at Madison, March 2002.
35. Optimal paths related to transport problems, University of Kentucky, March 2002.
36. Optimal paths related to transport problems, Brown University, January 2002
37. Optimal paths related to transport problems, AMS annual meeting at San Diego, January 2002.