Professor Hempling is an Administrative Law Judge at the Federal Energy Regulatory Commission. Before his June 2021 appointment, he worked as a litigator, appellate counsel, regulatory advisor, arbitrator and expert witness, appearing before federal and state courts and commissions, arbitration panels, U.S. congressional committees and state legislative committees. His electricity clients have included all industry sectors: state regulatory commissions and attorneys general, utilities, consumer advocates, independent competitors, regional transmission organizations, municipal and rural cooperative systems, environmental organizations and labor unions.