Expert on food webs and fisheries for inland lakes, Great Lakes and marine systems
- Food web interactions and fisheries
- Lake ecosystems
- Marine ecosystems
- Climate change effects on Lake Superior
- Award of Excellence, American Fisheries Society
- Editor, "The Trophic Cascade in Lakes"
- Editor, "Food Web Management: A Case Study of Lake Mendota"
- Science adviser, Grand Canyon Monitoring and Research Center
- Board of directors, the Billfish Foundation