- Smith Rock (2022)
- East San Diego County (10/21)
- Climbing Devils Tower (7/17)
- CBS Philly evening news (5/15)
- In the Needles (7/14)
- Getting western at Joshua Tree
- On 20/20 (3/30/12)
- At the Smithsonian (3/10/12)
- Ramfication in Algebra and Geometry at Emory (5/11)
- The integral test
- Brauer group in Kibbutz Ketura (1/10)
- Brauer group in Petra (1/10)
- Special session in Raleigh, NC (4/09)
- Hyderabad conference (1/09)
- Brauer Group in Pingree Park, Colorado (2008)
- Linear algebraic groups and cohomology at Emory (5/07)
- Wall climbing in Yosemite
- Ropeless in Joshua Tree
- In Red Rocks