Dr. Friedmann is one of the most widely known and authoritative experts in the US on carbon removal (CO₂ drawdown from the air and oceans), CO₂ conversion and use (carbon-to-value), hydrogen, industrial decarbonization, green manufacturing, and carbon capture and sequestration.He served as Principal Deputy Assistant Secretary for the Office of Fossil Energy at the Department of Energy during the Obama Administration, where he was responsible for DOE's R&D program in advanced fossil energy systems, carbon capture, and storage (CCS), CO₂ utilization, and advanced power generation. More recently, he was a Senior Research Scholar at the Center on Global Energy Policy at Columbia. He has held positions at Lawrence Livermore National Laboratory, including Chief Energy Technologist.