Interim Director

Center for Environmental Health and Toxicology
University of Nebraska Medical Center
College of Public Health

Professional Summary

  • Director, Nebraska Watershed Network, University of Nebraska at Omaha, Omaha, Nebraska. 2012- present.
  • Interim Director, Center for Environmental Health and Toxicology, University of Nebraska Medical Center, Omaha, Nebraska. 2011-present.  
  • Professor, Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center. 2007-present.
  • Professor, (Courtesy appointment) Center for Global Health and Development, College of Public Health, University of Nebraska Medical Center. 2010-present.
  • Professor, (Courtesy appointment) School of Natural Resources, University of Nebraska Lincoln. 2009-present.
  • Professor, Department of Biology, University of Nebraska at Omaha. 2004-present.


  • PhD 1991 Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder. 
  • MS  1981 Department of Fisheries and Oceanic Science, University of Washington Seattle. 
  • BS  1978 Department of Zoology, Miami University, Oxford, Ohio

Research Interest & Projects

  • Land use and its impact on water quality and environmental health.
  • The use of fish as bioenvironmental sentinel organisms.
  • Emerging contaminants and their effects on local aquatic biota and human health.
  • Gene expression in bioenvironmental sentinel organisms as indicators of exposure to toxic compounds.
  • Development of bio-monitoring organisms for use in Latin America.

Selected Publications

  • Knight, L.A., M.K. Christensen, A.J. Trease, P.H. Davis, and A.S. Kolok. 2013. The spring runoff in Nebraska’s Elkhorn River watershed and its impact on two environmental sentinel species.  Environmental Toxicology and Chemistry, 32:1544-1551.
  • Alvarez, S., A.S. Kolok, L.F. Jimenez, C. Granados and J.A. Palacio. 2012. Mercury concentrations in muscle and liver tissue of fish from marshes along the Magdalena River, Colombia. Bulletin of Environmental Contamination and Toxicology. 89: 836-840.
  • Sellin-Jeffries, M.K., A.C. Mehinto, B.J. Carter, N.D. Denslow and A.S. Kolok. 2012. Taking microarrays to the field: Differential hepatic gene expression of caged fathead minnows from Nebraska watersheds. Environmental Science and Technology. 46: 1877–1885.
  • Alvarez, S., A.M. Jessick, J.A. Palacio and A.S. Kolok. 2012. Methylmercury concentrations in six fish species from two Colombian rivers. Bulletin of Environmental Contamination and Toxicology. 88: 65-68.
  • Kolok, A.S., J.T. Miller and H.L. Schoenfuss. 2012. The mini-mobile environmental monitoring unit: A novel bio-assessment tool. Journal of Environmental Monitoring. 14: 202-208.
  • Sellin-Jeffries, M. K., K. Abbott, T. Cowman and A.S. Kolok. 2011. Occurrence and endocrine effects of agrichemicals in a small Nebraska, USA, watershed. Environmental Toxicology and Chemistry 30:2253-2260.
  • Sellin-Jeffries, M.K., N.H. Conoan, M.B. Cox, V.S. Wilson, J.L. Sangster, T. Cowman, L.A. Knight, S.L. Bartelt-Hunt and A.S. Kolok.  2011. The anti-estrogenic activity of   sediments from agriculturally-intense watersheds: Assessment using in vivo and in vitro assays. Aquatic   Toxicology 105:189-198.
  • Kolok, A.S., H.L. Schoenfuss, T. Vail, and C. Propper. 2011. Empowering citizen scientists: The strength of many in monitoring biologically active environmental contaminants. Bioscience 61 (8) 626-630.
  • Bartelt-Hunt, D. D. Snow, T. Damon-Powell, D. Brown, M. Schwarz and A.S. Kolok. 2011. Quantitative evaluation of laboratory uptake rates for pesticides, pharmaceuticals and steroid hormones using polar organic chemical integrative samplers. Environmental Toxicology and Chemistry. 30:1412-1420.
  • Kolok, A.S. and H.L. Schoenfuss. 2011. Environmental scientists, biologically active compounds and sustainability: The vital role for small-scale science. Environmental Science and Technology 45:39-44. 

Professional Affiliations

  • American Fisheries Society
  • Society of Environmental Toxicology and Chemistry

contact alan kolok
Alan Kolok, PhD

University of Nebraska at Omaha 
Allwine Hall
Phone: 402-554-3545