Raymond H. Johnson, Ph.D., has more than 20 years’ experience in groundwater geochemistry and hydrogeology. For the past five years, he has been providing uranium geochemistry, reactive transport modeling, and hydrogeology expertise at legacy uranium mill sites as a contractor (currently Navarro Research and Engineering Inc.) for the U.S. Department of Energy Office of Legacy Management.
Prior to this, Johnson worked for 12 years with the U.S. Geological Survey in Denver, Colorado, conducting research using reactive transport models to better understand potential groundwater impacts related to abandoned and future metal mines. This included abandoned hard-rock mines in Silverton, Colorado, and a proposed in situ leach uranium mine in South Dakota.
While at the USGS, Johnson cotaught several geochemical modeling classes with other USGS geochemistry experts, including David Parkhurst, the main author of PHREEQC. He has also taught several geochemical and reactive transport modeling classes in Finland and South Africa. In addition, Johnson has cotaught several workshops on geochemical reaction modeling with Bill Deutsch, Ph.D., for government agencies and professional development organizations, including the U.S. Nuclear Regulatory Commission, the U.S. Department of Energy, and NGWA.
Johnson holds a master’s degree from the University of Waterloo in Waterloo, Ontario, Canada, which involved research on the geochemistry and hydrogeology of abandoned nickel tailings in Sudbury, Ontario. He obtained his Ph.D. at the Colorado School of Mines in Golden, Colorado, where his research involved the use of ground-penetrating radar to calibrate multiphase flow models of dense non-aqueous phase liquid spills.