David Tilman is an American ecologist known for his research in biodiversity and ecosystem functioning. He has contributed significantly to understanding how different species interact within ecosystems and the importance of biodiversity for ecosystem health. His work emphasizes the role of diverse plant communities in enhancing productivity and resilience. Tilman has held academic positions at institutions like the University of Minnesota, where he has led various studies on the effects of land use and climate change on ecosystems. His research has implications for conservation efforts and sustainable agriculture, highlighting the need to maintain diverse ecosystems for future generations.