Hari Viswanathan holds advanced degrees in chemical and environmental engineering and is a senior scientist in the Computational Earth Science group at Los Alamos National Laboratory. He is PI on multiple energy security projects (OBES, DOE FECM) that have been a combination of R&D and programmatic work leading to a strong publication record of over 125 peer-reviewed journal publications on subsurface energy applications with an h-index of 46 and over 7000 citations. He is a fellow of the Geological Society of America and LANL Fellows Prize winner for Outstanding Research. Viswanathan has expertise in wellbore integrity, reservoir integrity, reservoir modeling and machine learning, all critical elements that need to be integrated to improve identification and characterization of undocumented orphan wells. He has led large multi-disciplinary, multi-institutional projects in DOE FECM application areas such as unconventional oil and gas and carbon sequestration applications. He has also worked on nuclear waste disposal, nuclear nonproliferation and other DOE mission critical programs where he has integrated field observations, laboratory measurements, predictive modeling and uncertainty quantification. He is the multi-lab technical lead for DOE’s Undocumented Orphan Well Program.