| 2007. | Special Symposium - Environmental Change, Extinction Risk, and the Maintenance of Biodiversity through Time, Annual Meeting Ecological Society of America. San Jose. |
| 2007. | Hewitt Club Lecture Series, Dept. of Geology, University of California Riverside. |
| 2007. | Paleobiology Seminar, Dept. of Geological and Environmental Sciences, Stanford University. |
| 2007. | Geological Sciences and Marine Chemistry Seminar, Scripps Institution of Oceanography. |
| 2006. | Evolutionary Morphology Seminar Series, Dept. of Geophysical Sciences, University of Chicago. |
| 2004. | Fossil Coffee Seminar Series, University of California Museum of Paleontology, UC Berkeley. |
| 2004. | Biology of Extinction, First Okazaki Research Conference, Okazaki Research Institute, Japan. |
| 2003. | Whole Earth Seminar Series, Earth Sciences Dept., University of California Santa Cruz. |
| 2003. | Seminar Colloquium, Geosciences Dept., San Francisco State University. |
| 2002. | Special Symposium - Systematics & Stratigraphy, ECOS VIII, Toulouse, France. |
| 2002. | Seminar Colloquium, Dept. of Geological Sciences, University of Iowa. |
| 2001. | Seminar Colloquium, Dept. of Integrative Biology, University of California Berkeley. |
| 2000. | Seminar Colloquium, Dept. of Geology, University of California Davis. |
| 2000. | Evolutionary Morphology Seminar Series, Committee on Evolutionary Biology, University of Chicago. |