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Professional Information

Prof. Johnson's group focuses on environmental geochemistry, isotope geochemistry, and hydrogeology.  The group is working to better understand several redox-sensitive contaminant elements, including chromium, selenium, uranium, and mercury.  They develop and use methods for measurement of the stable isotopes of these and other elements as indicators of key geochemical reactions, contamination sources, and past environments on Earth.

The group uses the department's multicollector ICP-MS laboratory constantly to make these measurements and often develops or improves measurement methods. 


  • GEOL 117: The Oceans
  • GEOL 118: Natural Disasters
  • GEOL 370/GEOG 370/ESE 320: Water Planet/Water Crisis
  • GEOL 470: Hydrogeology
  • GEOL 562: Isotope Geochemistry
  • GEOL 579: Isotope Hydrogeology


Ph.D., University of California at Berkeley

Office Address

3030A Natural History Building


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  • GSA Fellow

    Johnson, Tom (Recipient), 2018

    Prize: Member/Fellow