Andrew Nelson is a PhD candidate and Presidential Graduate Fellow in Human Toxicology. He studies radioactivity associated with unconventional drilling of shale gas. Nelson earned his B.A. in Biochemistry from the University of Colorado in 2009, and an M.S. in Environmental Engineering from the Colorado School of Mines in 2010. Much of his work to date focuses on developing methods suitable for monitoring levels of naturally occurring radioactive materials present in wastes generated by unconventional natural gas exploration. Nelson’s research has helped develop partitioning models to be used in the development of waste management strategies for unconventional drilling.