University of Wisconsin–Madison

Clark Johnson

Clark M. Johnson
Vilas Distinguished Professor
Isotope Geochemistry, Astrobiology, Geochronology, & Petrology 
(608) 262-1710
Office: 329 Weeks Hall






My primary research interests lie in application of stable and radiogenic isotopes to study of ancient life and crust and mantle evolution. This includes topics ranging from astrobiology to the origin of igneous rocks and evolution of volcanic systems. I am also interested in mountain building and metamorphism, as well as low-temperature studies involving diageneis, sedimentary provenance, migration of ancient people, and geomicrobiology.

For more information about research, visit the ICP-TIMS Isotope Laboratory web site.

A list of publications and PDF files may be found here.

A complete vitae may be found here.


All levels of undergraduate and graduate courses, seminars, and field courses, including Life in the Universe, Introductory Geology, Geology of National Parks, Earthquakes and Volcanoes, Geobiology, Igneous Petrology, Geochemistry, Magmatic Systems, Mountain Belts, Phase Equilibria, Thermodynamics, Advanced Petrology and Geochemistry, and Isotope Geology.

Departmental Responsibilities

Major responsibilities include PI for the Wisconsin Astrobiology Research Consortium.