"Lookup Tables to Compute High Energy Cosmic Ray Induced Atmospheric Ionization and Changes in Atmospheric Chemistry." Journal of Cosmology and Astroparticle Physics (in press) (with D. Atri, A.L. Melott).
"Atmospheric Consequences of Cosmic Ray Variability in the Extragalactic Shock Model: II Revised Ionization Levels and Their Consequences." Journal of Geophysical Research (in press) (with A.L. Melott, D. Atri, M.V. Medvedev, G.W. Wilson, M.J. Murray).
"Cometary Airbursts and Atmospheric Chemistry: Tunguska and a Candidate Younger Eryas Event." Geology 38: 383 (2010) (with A.L. Melott, G. Dreschhoff, Carey K. Johnson).
"Gamma-ray Bursts as a Threat to Life on Earth." International Journal of Astrobiology 8: 183 (2009).
"An In-Class Discussion Activity on the Nature of Science and Intelligent Design." The Physics Teacher 47:106 (February 2009).
"Atmospheric Consequences of Cosmic Ray Variability in the Extragalactic Shock Model." Journal of Geophysical Research 113: E10007 (October 2008) (with A.L. Melott, A.J. Krejci, M.V. Medvedev, G.W. Wilson, M.J. Murray).
"Amphibian Nitrate Stress as an Additional Terrestrial Threat from Astrophysical Ionizing Radiation Events?" Astrobiology 8: 731 (August 2008) (with M.D. Honeyman).
"Discussing Science and Intelligent Design in a Physical Science Course," Mid-America Regional Astrophysics Conference, Kansas City, Mo., April 2010
"Improving Estimates of Biospheric Effects of Gamma-Ray Bursts," Astrobiology Science Conference, Houston, Texas, April 2010
"Exploding Stars and the End of the World," HiPACE Lecture, WU, February 2010
"A Scientist's Perspective on Global Warming," Topeka Downtown Optimists, January 2010
"Not Another Disaster Movie! Exploding Stars and the End of the World," Northeast Kansas Amateur Astronomer League, Topeka, January 2010
Not Another Disaster Movie! Exploding Stars and the End of the World," Newton (Kan.) High School physics class, November 2009
"Late Ordovician Geographic Patterns of Extinction Compared with Wimulations of Astrophysical Ionizing Radiation Damage," Geological Society of America, Portland, Ore., October 2009
"Comparing Simulations of Astrophysical Ionizing Radiation Damage with Late Ordovician Geographic Patterns of Extinction," Mid-America Regional Astrophysics Conference, Kansas City, Mo., April 2009 (with A.L. Melott)
"Late Ordovician Geographic Patterns of Extinction Compared with Wimulations of Astrophysical Ionizing Radiation Damage," Kansas Academy of Science, Topeka, March 2009 (with A.L. Melott)
"Gamma-Ray Bursts and the Earth," Embedded Systems Laboratory symposium "Cosmic Cataclysms and Life," Frascati, Italy, November 2008
'High Energy Cosmic Ray Effects on Terrestrial Atmospheric Chemistry, 60,000 hours on Intel 64 cluster (Abe)," National Center for Supercomputing Applications, 9/2009-9/2010. Dimitra Atri, co-investigator
"A Lookup Table to Compute High Energy Cosmic Ray Effects on Terrestrial Atmospheric Chemistry, 50,000 hours," National Center for Supercomputian Applications, 8/2009-8/2010. Adrian Melott, co-investigator
"Astrophysical Ionizing Photon Events and Primary Productivity of Earth's Oceans," NASA, $530,703 7/1/2009-6/30/2012. Adrian Melott and Patrick Neale, co-investigators
Washburn International Travel Grant November
Think Big Topeka participant to bring Google fiber project
Career mentor, University of the pacific Alumni Mentor Network
Star party, College Hill Neighborhood Association
Astronomy instructor Washburn Merit Badge Day 2009
Astrobiology videoconference for Lakin (Kan.) High physics class
Interview, "Cosmic Hazards" French TV, February 2010
Articles on work looking for signatures of comet impacts in ice cores in online publications such as Science Daily, December 2009
Work on terrestrial effects of solar flares noted in report of National Research Council "Severe Space Weather Events: Understanding Societal and Economic Impacts."
Work on gamma-ray bursts as a threat to life on Earth top of National Geographic online article (http://news.nationalgeographic.com/news/2009/04/090403-gamma-ray-extinction.html), April 2009
Work on solar flares mentioned in "Bracing for a Solar Superstorm," Scientific American, August 2008
Articles referee, Annales Geophysicae
Article referee, Journal of Astrobiology
Manuscript referee, International Year of Planet Earth Life volume (Springer Verlag on behalf of UNESCO)