The University of Illinois Rayleigh/Na lidar was first installed at the Amundsen Scott South Pole Station in 1989 to measure the perturbations in Na and atmospheric density, aerosols, and polar stratospheric clouds. The atmospheric temperature from 30 to 55 km altitudes was derived from the measured relative atmospheric density profiles. Richard Collins wintered-over to operate the lidar and wrote his Ph.D. dissertation on the scientific results. The current South Pole lidar is a much more sophisitcated system that was installed in 1993. It measures Na density profiles at 589 nm and aerosols scattering at 1064 nm and 532 nm as well as the orthogonal polarization components of the backscattered signal at 532 nm. P. J. Charpentier is this year's winter-over scientist at South Pole. His email address is sparkle@sunflower.spole.gov.