Appointed to the chemistry faculty of Princeton University in 1985, Lehmann received both the Henry and Camille Dreyfus Award for new faculty and the Presidential Young Investigator Award from the National Science Foundation in his first year with the university. In 1987, the university acknowledged him with the Camille and Henry Dreyfus Teacher-Scholar Award.
Lehmann was appointed to the chemistry faculty of Princeton University in 1985, receiving recognition for his work in his first year at the university. He received both the Henry and Camille Dreyfus Award for new faculty and the Presidential Young Investigator Award from the National Science Foundation. The university acknowledged him with the Camille and Henry Dreyfus Teacher-Scholar Award in 1987.