Ronald Adler has worked mainly in theoretical particle physics and general relativity. His experience also includes work in experimental particle physics, experimental general relativity, experiments in high temperature superconductivity, satellite and orbital launch systems, and digital image analysis. He is the co-author of a classic textbook on general relativity and has devoted over half a century to teaching physics students at a number of universities. He is also the author of many research publications, and is currently working on fundamental physics problems including the nature of dark matter and dark energy, properties of black holes and gravitational waves, the birth of the universe, and physics at the Planck scale. In his free time he enjoys mountaineering and hiking.