Board Member and Chief Ocean Scientist, Deep Green. 2018-present.

Science Advisor for Oceans, World Economic Forum. 2017-2018. 

Executive Vice President and Chief Scientist for Oceans. 2012-2018. Conservation International.

Senior Vice President and Chief Ocean Scientist, from 2009 -2012. Conservation International.

Senior Vice President for Exploration and Conservation, from 2009. New England Aquarium. 

Adjunct Professor, from 2010. Lincoln University, Christchurch New Zealand. 

Honorary Associate professor Marine Science, from 2007. Auckland University, New Zealand. 

Vice President, Global Marine Programs, 2001-2009. New England Aquarium.

Director, Conservation, 1993-2001. New England Aquarium.

Marine Biologist and Japan Program Manager, 1989-1993. National Oceanic and Atmospheric Administration, National Undersea Research Program.

Research Associate, 1982-Present. College of the Atlantic.

Antarctic Cetacean Scientist, 1986. Ecosystem Studies, U.S. Department of Commerce, National Marine Fisheries Service.

Research Associate, 1980-1988. Right Whale Research, New England Aquarium.

Marine Research Specialist, Chief Scientist, 1978-1980. Cetacean and Turtle Assessment Program, University of Rhode Island, Graduate School of Oceanography.