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Laser Doppler electrophoresis is a descriptive name for a new analytical technique for the determination of the electrophoretic mobilities of particles in suspension or of macromolecules in solution. It is a combination of electrophoresis, the motion of charged particles in an electric field, with laser Doppler velocimetry, a technique for determining the velocities of particles by measuring the Doppler shift of laser light which is scattered from them. The laser Doppler approach differs from other types of electrophoresis in that the velocities of the particles are measured continuously, rather than being inferred from a measurement of displacement over a period of time. Several names have been applied to this new technique. The most common names in current use in the literature are laser Doppler spectroscopy and electrophoretic light scattering (ELS). We shall use primarily the latter name and the abbreviation ELS.