This program is supported by the National Science Foundation under grant AST 0227870. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.

The "NASA Astronomer of the Week" profile is supported by the National Aeronautics and Space Administration under an Education and Public Outreach supplement to Grant/Contract/Agreement No. NAG5-13057 issued through the Office of Space Science.