Knezovich, John

Adjunct Professor
Department of Environmental Toxicology
Director, University Relations & Science Education
Lawrence Livermore National Laboratory
P.O. Box 808; L-019
Livermore, CA 94550 USA
Phone: (925) 422-0925



The environmental fate and risk assessment of organic contaminants, heavy metals and radionuclides. Emphasis on the application of analytical techniques to assess the bioavailability of contaminants and their in vivo disposition. Use of accelerator mass spectrometry to assess the fate of low-doses (i.e., environmental concentrations) of contaminants through the application of isotopic tracers.


  • Texas A&M University - Certificate in National Security Affairs - 2009
  • University of California, Davis - Chemical Ecology - 1983 Ph.D.
  • University of California, Davis - Chemical Ecology - 1980 M.S.
  • University of the Pacific - Biology - 1977 B.A.


  • ETX102A, ETX120, ETX240, & ETX298 - Contributor

Professional Activities:

Representative Publications:

J. Knezovich, T. Brown, B. Buchholz, R. Finkel, T. Guilderson, M. Kashgarian, G. Nimz, T. Ognibene, S. Tumey, J. Vogel (Eds.), “Proceedings of the 10th International Conference on Accelerator Mass Spectrometry,” Nucl. Instr. and Meth. B259, 816 pp. (2007).

C. M. Schaldach, G. Bench, J. J. DeYoreo, T. Esposito, D. P. Fergenson, J. Ferreira, E. Gard, P. Grant, C. Hollars, J. Horn, T. Huser, M. Kashgarian, J. Knezovich, S. M. Lane, A. J. Malkin, M. Pitesky, C. Talley, H. J. Tobias, B. Woods, K.-J. Wu, S. P. Velsko, "State of the Art in Characterizing Threats: Non-DNA Methods for Biological Signatures", in Microbial Forensics, R.G. Breeze, B. Budowle, and S. Schutzer, Eds. (Elsevier/Academic Press) Chapter 13 (2005).

A.H. Love, J.R. Hunt and J.P. Knezovich, "Reconstructing Tritium Exposure Using Tree Rings at Lawrence Berkeley National Laboratory, California," Environmental Science and Technology 37, 4330-4335 (2003).

F.L. Harrison and J.P. Knezovich, "Effects of Radiation on Aquatic and Terrestrial Organisms," in Radioecology: Radioactivity & Ecosystems, E. Van der Stricht and R. Kirchmann Eds. (International Union of Radioecology, Liege, Belgium) Chapter V, pp. 317-375 (2001).

P.A. O’Day, S. A. Carroll, S. Randall, R.E. Martinelli, J.A. Jelinski, S.L. Anderson and J.P. Knezovich, “Metal Speciation and Toxicity in Contaminated Estuary Sediments, Alameda Naval Air Station, California,” Environmental Science and Technology 34, 3665-3673 (2000).

T.J. Ognibene, T.A. Brown, J.P.Knezovich, M.L. Roberts, J.R. Southon and J.S. Vogel, “Ion-Optics Calculations of the LLNL Compact AMS System for Biochemical 14C Measurements, Nucl. Instr. and Meth. B172, 47-51 (2000).

F. Harrison, J. Knezovich and D. Layton, "Assessment of Risks to Marine Aquatic Populations Resulting From Exposures to Radionuclides in Arctic Seas," in Radionuclides in the Arctic Seas from the Former Soviet Union: Potential Health and Ecological Effects, D. Layton, R. Edson, M. Varela and B. Napier Eds., Arctic Nuclear Waste Assessment Program, Office of Naval Research, Chapter 5, (November, 1997).

J.P. Knezovich, D.J. Steichen, J. Jelinski and S.L. Anderson, "Sulfide Tolerance of Four Marine Species Used to Evaluate Sediment and Pore-Water Toxicity," Bull. Environm. Contam. Toxicol. 57, 450-457 (1996).

T.A. Brown, A.A. Marchetti, R.E. Martinelli, C.C. Cox, J. P. Knezovich, and T.F. Hamilton, "Actinide Measurements by Accelerator Mass Spectrometry at Lawrence Livermore National Laboratory," Nucl. Instr. and Meth. B223-224, 788-795 (2004).