| | Haj-Tas, M. | the Third Kuwait International Conference on Life Sciences Symposium on Communication Sciences and Disorders | Kuwait | November, 2018 | Lecturer | |
| | Haj-Tas, M., Kamal, S., Al-Bustan | the Third Kuwait International Conference on Life Sciences Symposium on Communication Sciences and Disorders | Kuwait | November 2018 | Lecturer | |
| | Haj-Tas, M. | One World, Many Voices: Science and Community Joint World Congress | Japan | July 2018 | Lecturer | |
| | Haj-Tas, M. | One World, Many Voices: Science and Community Joint World Congress | Japan | July 2018 | Participant | |
| | Haj-Tas, M., Kamal, S., & Ayyad, A. | One World, Many Voices: Science and Community Joint World Congress | Japan | July 2018 | Participant | |
| | Logan, K. & Haj-Tas, M. | Fourth World Congress on Fluency Disorders | Canada (Montreal) | 9/2003 | Participant | |
| | Reichel, I., Ademola-Sokoya, G., Bakhtiar, M., Barrett, H., Busto-Marolt, L., Caesar, N., Diaz, C., Haj-Tas, M., Lilian, D., Makauskienė, V., Miyamoto, S., Shah, E., de Touzet, B., Yasin, S.
| 9th World Congress for People Who Stutter | (Argentina) Buenos Aires | 5/5/2011 to 11/5/2011 | Participant | |
| | Haj-Tas, M., Natour, Y., & Nawaf, H. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2016 Convention) | United States (Philadelphia, PA) | 17/11/2016 - 19/11/2016 | Participant | |
| | Haj-Tas, M. & Kamal, S. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2016 Convention) | United States (Philadelphia, PA) | 11/2016 | Participant | |
| | Haj-Tas, M. & Logan, K. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2006 Convention) | United States (Miami, FL) | 11/2006 | Participant | |
| | Haj-Tas, M. & Logan, K. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2005 Convention) | United States (San Diego, CA) | 11/2005 | Participant | |
| | Haj-Tas, M., Park, J., & Logan, ,K. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2004 Convention) | United States (Philadelphia, PA) | 11/2004 | Participant | |
| | Logan, K., Haj-Tas, M., & Metcalf, L. | Annual Convention of the American Speech-Language-Hearing Association (ASHA 2002 Convention) | United States (Atlanta, GA) | 11/2002 | Participant | |
