Meet Gei's

Robert Gensemer, Ph.D.

Vice President & Senior Ecotoxicologist

Dr. Robert (Bob) Gensemer has 30 years of academic and industrial experience in aquatic ecology and limnology, ecotoxicology and ecological risk assessment. His project experience includes general aquatic toxicology, the conduct and oversight of ecological risk assessments for both aquatic and terrestrial habitats, sediment remedial investigations under EPA’s Superfund program and the regulatory implementation of ambient water quality criteria for protection of aquatic life.

Since joining GEI, Dr. Gensemer has established National leadership with respect to the regulatory implementation of new bioavailability-based models for development of aquatic life criteria, such as the Biotic Ligand Model for copper, aluminum and other metals. He has also helped strengthen GEI’s technical and strategic leadership in the application of ecological risk assessment to the remediation of contaminated sediments, being a key member of utility client project teams at some of the largest and most complex Superfund remediation sites in the U.S.

Dr. Gensemer received his Ph.D. in Biological Sciences from The University of Michigan in 1989, and a Bachelor of Arts, majoring in Botany and Microbiology, from The Ohio Wesleyan University in 1982.

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Fort Collins, Colorado


  • Author of over 35 peer-reviewed journal publications and books
  • Invited Participant: Society of Environmental Toxicology and Chemistry (SETAC ) Technical Workshop on Bioavailability-based Water Quality Criteria for Metals (2017)
  • GEI Best Project Management Team (2015): Leveraging One for the Good of the Many: Creative Thinking for the Advocacy and Application of the Biotic Ligand Model