| Graduate Colloquim Talks at Department of Mathematics, Northern Illinois University, | DeKalb, Illinois, Sept. 13--14, 2007. |
| Colloquium talk at Department of Statistics, Harvard University | Cambridge, Boston, Oct. 15, 2007. |
| Colloquium talk at Department of Statistics, University of Georgia | Athens, GA, Jan. 31, 2008. |
| Seminar Talk at Department of Applied Mathematics, Cambridge University | Cambridge, England, March 11, 2008. |
| Seminar Talk at Department of Mathematics, Penn State University | State University, Penn, March 31, 2008. |
| Two seminar talks at Department of Mathematics, Zhongshan University | Guangzhou, China, May 13 and 15, 2008. |
| Colloquium talk at Department of Mathematics, Southern Polytechnic State University, | Atlanta, GA, Sept. 22, 2008 |
| Seminar talk at Department of Mathematics, Harvard University | Cambridge, Boston, Oct. 30, 2008 |
| Seminar Talk at School of Mathematics, Georgia Institute of Technology | Atlanta, Georgia, Jan. 26, 2009 |
| Seminar Talk at Department of Mathematics, University of Alabama, | Tuscaloosa, Feb. 19, 2009 |
| Invited talk at Annual conference on Georgia Scientific Computing, Emory University, | Feb. 22, 2009 |
| Colloquium Talk at Department of Mathematics, The Renmin University of China, | Beijing, China, March 5, 2009 |
| Colloquium Talk at Department of Mathematics, Zhejiang University, | Hangzhou, China, March 12, 2009 |
| Invited Talk at Institute of Bioinformatics, University of Georgia, | Athens, Georgia, Oct. 8, 2009 |