| 2004-present. |
Biology Representative, Affiliated Institutes, American Association for the Advancement of Science. |
| 2002-present. |
Special Issues Editor, Paleontologia Electronica. |
| 2007. |
Chair, Organizing Committee, CalPaleo Annual Meeting. |
| 2005 |
Co-Organizer, Annual Meetings of the American Malacological Society and the Western Society of Malacologists. |
| 2005. |
President, Western Society of Malacologists. |
| 2004. |
President-Elect and Council Member, Western Society of Malacologists. |
| 2003-2004. |
Associate Editor, Journal of Paleontology. |
| 2003. |
Organizing Committee, Symposium: Biodiversity: Past, Present and Future. 84 Annual Meeting of the AAAS, Pacific Division. |
| 2002. |
Roopnarine, P. D. and C. M. Tang, organizers. Evolutionary paleobiology and paleoecology of the Bivalvia. Special Session. Geological Society of America. Annual Meeting, Denver. |
| 2002-2003. |
Vice-President, SEPM Pacific Division. |
| 2001-2003. |
Schuchert Award Committee, The Paleontological Society. |
| 2001. |
Organized the first CAS Morphometrics Workshop, hosted jointly with UC Berkeley. |
| 2001. |
Organizing Committee, Seventh North American Paleontological Conference. |
| 2000-2004. |
Councilor-At-Large, American Malacological Society. |
