Professor Klein teaches and writes in the fields of capital punishment, criminal law, and criminal procedure. Her research has focused on the Eighth Amendment, arbitrariness, and cruelty in punishment. Before joining the Washington and Lee Law faculty in 2024, Professor Klein was an Assistant Professor of Law at St. Mary's University School of Law in San Antonio, Texas, where she was named an Englehardt Research Fellow and received the Al Kauffman Faculty Excellence & Support Award. She was a Visiting Assistant Professor of Law at Washington and Lee University School of Law from 2019 to 2022. Before joining the legal academy, Professor Klein clerked for the Honorable Sally D. Adkins of the Supreme Court of Maryland and the Honorable Danny J. Boggs of the United States Court of Appeals for the Sixth Circuit.