Mark is a Principal Member of the Techncial staff with a broad range of research interests spanning physics, geophysics, and computer science, with a focus on national security applications. His past and current projects include: asteroid impacts and planetary defense; climate change and paleoclimatology; nuclear weapons effects; high pressure equations of state and energetic materials; high-consequence risk assessment; evolutionary computing and robotic flight; global monitoring systems; and prediction markets and intelligence analysis. Mark received his BS in physics from Colorado State University in 1977 and his MS in applied physics from Caltech in 1978. He received his PhD in applied physics with a geological and planetary science focus from Caltech in 1983 and immediately joined the technical staff at Sandia. He is also an adjunct professor in the Earth and Planetary Sciences department at the University of New Mexico and a Fellow of the Committee for Skeptical Inquiry.