"' Robert P . Behringer "'( born October 26, 1948 ) is an American physicist based at Duke University, whose research first dealt with Critical phenomena and transport properties in fluid helium, such as Rayleigh-B�nard convection, and since 1986 has been involved with granular material, where his most notable achievements have been in the development of the technique of photoelasticity to study spatio-temporal fluctuations.
