1. Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania.
2. Penn State Astrobiology Research Center, Pennsylvania State University, University Park, Pennsylvania.
3. NASA Astrobiology Institute Virtual Planetary Laboratory, University of Washington, Seattle, Washington.
4. Department of Astronomy, Cornell University, Ithaca, New York (beginning Fall 2014).
5. Departments of Math and Physics, Pennsylvania State University, University Park, Pennsylvania.