Cassandra G. Extavour

Cassandra G. Extavour is the Timken Professor of Organismic and Evolutionary Biology and Molecular and Cellular Biology at Harvard University, and a Howard Hughes Medical Institute Investigator. She holds a joint appointment in the Department of Molecular and Cellular Biology and is affiliated with Harvard College. Her research focuses on the evolution and development of germ cells and reproductive systems in arthropods, particularly exploring mechanisms of germ cell specification and the evolutionary transitions in developmental processes.

Extavour's work integrates molecular genetics, comparative embryology, and evolutionary theory to study model organisms like spiders, crickets, and fruit flies. She leads the Extavour Lab at Harvard's Biological Laboratories, which collaborates with institutions globally. Notable contributions include discoveries about germ cell specification diversity across arthropods and the role of developmental constraints in life-history evolution.

Her educational roles include teaching courses on invertebrate biology and integrated science at Harvard. Recent accolades include her HHMI Investigator status and recognition in Quanta Magazine for career contributions. The lab actively engages in genomic projects, such as cricket genome analysis, and explores molecular mechanisms underlying evolutionary innovations. Students and postdocs in her lab investigate topics ranging from germ line determinants to symbiotic influences on gene evolution.