James Mallet

James Mallet is a Professor of Organismic and Evolutionary Biology at Harvard University's Faculty of Arts and Sciences. His research focuses on evolution, hybridization, and speciation in butterflies, particularly Heliconius species. He leads the Mallet Lab, which combines fieldwork (e.g., Amazon rainforest studies), population genetics, and genomics to explore mechanisms of species divergence and introgression. Notable projects include examining hybrid sterility in Heliconius, genomic analysis of hybrid zones, and the ecological impacts of anthropogenic pressures on biodiversity hotspots. The lab collaborates internationally, with members including Tianzhu Xiong, Shuzhe Guan, and Fernando Seixas. Mallet has advised students like Nate Edelman, whose thesis explored hybridization's evolutionary effects. His work bridges theoretical and empirical approaches, emphasizing the dynamic nature of species boundaries.

Research interests span evolutionary genetics, speciation mechanisms, and biodiversity conservation. Key methods include genomic sequencing, field experiments, and phylogenetic modeling. Recent publications emphasize hybridization’s role in adaptation, the collapse of genetic incompatibilities, and the genomic architecture of mimicry traits. The lab’s work has implications for understanding species resilience in changing environments and the genetic basis of evolutionary innovations.

Lab activities include organizing thesis defenses (e.g., Edelman's 2020 defense on hybridization effects) and maintaining a team focused on computational genomics and field studies. While no explicit awards are listed, his contributions to evolutionary biology are widely cited. The Mallet Lab’s interdisciplinary approach integrates ecology, genetics, and computational biology to address fundamental questions about life’s diversity and adaptation.