Claim: John Papaloizou, a British theoretical physicist, not only discovered the Papaloizou-Pringle instability together with Jim Pringle in 1984, but also made major contributions in various areas; such as the radial-orbit instability, toroidal modes in stars and different instabilities in accretion disks.
Evidence: John Christopher Baillie Papaloizou FRS (born 1947) is a British theoretical physicist. He discovered the Papaloizou-Pringle instability together with Jim Pringle in 1984. Papaloizou also made major contributions in various areas such as the radial-orbit instability, toroidal modes in stars and different instabilities in accretion disks.