1. “Asymptotic Expansion of the Null Distributions of Test Statistics for Profile Analysis under General Conditions”. 2008 Joint Statistical Meeting, Contributed Session in Statistical Testing, Denver, CO, August 3, 2008.

2. “Asymptotic Expansions for Multivariate Statistics under General Conditions: Applications to the Profile Analysis”, Department of Statistics, Addis Ababa University, Addis Ababa, Ethiopia, July 14, 2008.

3. “On the Null and Non-null Distributions in Profile Analysis under Nonnormality”. International Conference on Multivariate Statistical Modelling and High Dimensional Data Mining, Invited Session on Multivariate Estimation and Testing, Kayseri, Turkey, June 23, 2008.

4. “Testing Homogeneity of Variances for Non-normal Models Using Entropy”, 2007 Joint Statistical Meeting, Salt Lake City, Utah, August 2007.

5. “Robustness Study for Tests on Mean Vectors” (invited), Eastern China Normal University, Shanghai, China, June 1, 2007.

6. “Robustness Study of MANOVA Statistics for Profile Analysis and Tests of Dimensionality” (invited), Session on Matrices and Statistics, The 15th International Conference of Forum for Interdisciplinary Mathematics on Interdisciplinary Mathematical & Statistical Techniques, Shanghai, China, May 23, 2007.

7. “Testing Homogeneity of Variance for Non-normal Models Using Entropy”, Annual Meeting of the Montana Chapter of the American Statistical Association, Butte, Montana, September 2006.

8. “Duality Between Matrix Variate t and Matrix Variate V.G. Distributions”, Annual Meeting of the Institute of Mathematical Statistics, Rio de Janeiro, Brazil, August 2006.

9. “Nonparametric Methods in Multivariate Factorial Designs when the Number of Factor Levels is Large” (invited), Universität Hannover, Hanover, Germany, June 2006.

10. “Duality Between Matrix Variate t and Matrix Variate V.G. Distributions”, The fifteenth International Workshop on Matrices and Statistics, Uppsala, Sweden, June 2006.

11. “Multivariate Factorial Designs when The Number of Factor Levels is Large ”, University of Montana, Missoula, Montana, April 2006.

12. “Asymptotic Expansion for ANOVA and MANOVA under Non-normality”, South Dakota State University, Brookings, South Dakota, March 2006.

13. “Asymptotic Expansion for ANOVA and MANOVA under Non-normality”, Western Illinois University, Macomb, Illinois, March 2006.

14. “Multivariate Factorial Designs for Large Number of Factor Levels”, Texas tech University, Lubbock, Texas, February 2006.

15. “Asymptotic Expansion for Analysis of Variance under Non-normality” (invited), University of Kentucky, Lexington, Kentucky, October 2005.

16. “Asymptotics for Multivariate Mixed Models under Non-normality”(invited), Conference on Applied Statistics in Agriculture, Kansas State University, Manhattan, Kansas, April 2005.

17. “Asymptotic Expansion for the Null distribution of the ANOVA F-Statistic Under Non-normality”, 2005 Joint Statistical Meeting, Minneapolis, Minnesota, August 2005.

18. “Matrix Variate Skew Normal Distributions”, Eastern North America Regional Meeting, International Biometric Society, Austin, Texas, March 2005.

19. “Asymptotics for Testing Hypothesis in Some Variance Components Model under Nonnormality”, Justus F. Seely Memorial Conference, Oregon State University, Corvallis, Oregon, USA, August 2003.

20. “MANOVA under Nonnormality”. 10^th Spring Research Conference On Statistics In Industry And Technology, Institute of Mathematical Statistics, Dayton University, Dayton, Ohio, June 2003.

21. “The Problems of Low Dose Extrapolation”, Annual Conference of the Ethiopian Statistical Association, Addis Ababa University, Addis Ababa, Ethiopia, January 1998.