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Associate Professor of Wildlife Ecology, Oregon State University

I focus on investigating the interplay of physiological constraints, behavioral plasticity and environmental variability in populations of diving, airbreathing vertebrates - mostly pinnipeds. Recently I have also become more interested in predator-prey interactions. My projects include basic science and research applied toward conservation and management of marine living resources. I enjoy developing new experimental designs, technologies and analytical approaches.


  • 2006–present
    Associate Professor of Wildlife Ecology, Oregon State University
  • 2015–present
    Science Director, Alaska SeaLife Center
  • 1996–2006
    Research Scientist, Texas A&M University at Galveston
  • 1992–1996
    Postdoctoral Research Physiologist, Scripps Institution of Oceanography


  • 1992 
    University of Bielefeld, Dr. rer. nat.
  • 1988 
    University of Freiburg, Diplom


  • 2014
    In cold blood: evidence of Pacific sleeper shark (Somniosus pacificus) predation on Steller sea lions (Eumetopias jubatus) in the Gulf of Alaska, Fishery Bulletin 112:297-310
  • 2012
    Constraint lines and performance envelopes in behavioral physiology: the case of the aerobic dive limit, Frontiers in Physiology 2012:3.381
  • 2012
    Predation on an upper trophic marine predator, the Steller sea lion: evaluating high juvenile mortality in a density dependent conceptual framework, PLoS ONE 7(1):e30173
  • 2009
    Spatially explicit detection of predation on individual pinnipeds from implanted post-mortem satellite data transmitters, Endangered Species Research 10:135-143
  • 2009
    Diving into old age: muscular senescence in a large-bodied, long-lived mammal, the Weddell seal (Leptonychotes weddellii), Journal of Experimental Biology 212:790-796