Jeffrey David Adams (born 1956) is a mathematician at the University of Maryland who works on unitary representations of reductive Lie groups, and who led the project Atlas of Lie groups and representations that calculated the characters of the representations of E8. The project to calculate the representations of E8 has been compared to the Human Genome Project in scope. Together with and David Vogan, he co-authored a monograph on a geometric approach to the Langlands classification and Arthur's conjectures in the real case.