Zoologist specializing in polar bears and polar bear conservation. He became the chief scientist for Polar Bears International in 2010.
He earned a degree in wildlife management from the University of Idaho in 1975.
He won both the Indianapolis Prize and the Bambi Award in 2012.
He married Virginia Amstrup, who is also an environmental enthusiast.
He followed in the footsteps of Peter Medawar to become an influential zoologist.