| Santa Cruz, CA | 03/2007 | "Cosmic Evolution of the Intergalactic Medium" | UCSC colloquium |
| Lousville, KY | 02/2007 | "Cosmic Evolution of the Intergalactic Medium" | Univ. of Lousville colloquium |
| Irvine, CA | 01/2007 | "Probing the Interaction between Galaxy and the Intergalactic Medium" | UCI seminar |
| Athens, OH | 04/2006 | "Cosmic Evolution of the Intergalactic Medium" | Ohio Univ colloquium |
| Pittsburgh, PA | 04/2006 | "Cosmic Evolution of the Intergalactic Medium" | CMU seminar |
| Davis, CA | 03/2006 | "Probing the Warm-Hot Intergalactic Medium" | UC Davis seminar |
| Cambridge, MA | 10/2004 | "X-ray Study of the Local Hot Gas" | "Chandra Fellows Symposium" at CfA |
| Aspen, CO | 01/2004 | "Probing the Temerature-Density Relation of the IGM via the Ly-alpha Forest" | Aspen Winter Conference "The Large-scale Distribution of Mass & Light in the Universe" |
| Berkeley, CA | 10/2003 | "Probing the Warm-Hot Intergalactic Medium" | UC Berkeley seminar |
| Cambridge, MA | 10/2003 | "Probing Soft X-ray Emission from the Warm-hot Intergalactic Medium" | "Chandra Fellows Symposium" at CfA |
| Santa Fe, NM | 07/2003 | "Hydrodynamic Simulations of the Soft X-ray Emission from the Warm-hot Intergalactic Medium" | SF03 Cosmology Summer Workshop |
| Ann Arbor, MI | 05/2003 | "Probing the Cosmic Web in X-ray" | Great Lake Cosmology workshop |
| Huntsville, AL | 12/2002 | "Warm-Hot Intergalactic Medium: Numerical Simulations and Observations" | conference "Soft X-Ray Emission from Clusters of Galaxies and Related Phenomena" |
| Boulder, CO | 08/2002 | "Chandra Detection of X-ray Absorption from Local Warm/Hot Gas" | "The IGM/Galaxy Connection" conference |
| Cambridge, MA | 05/2001 | "Probing the Warm-Hot Intergalactic Medium" | Con-X facility science team meeting at CfA |
| Baltimore, MD | 04/2001 | "Chandra Observations of Low and High Redshift Quasars" | JHU seminar |
| Cambridge, MA | ??/2001 | "Probing the IGM with the OVI Absorption Lines" | MIT seminar |
| Cambridge, MA | ??/1999 | "Testing Cosmology by the X-ray Forest" | CfA seminar |
| Atlanta, GA | 01/1999 | "X-ray Absorption by the Intergalactic Medium" | AAS talk |