  This paper surveys the application of geometric algebra to the physics of
electrons. It first appeared in 1996 and is reproduced here with only minor
modifications. Subjects covered include non-relativistic and relativistic
spinors, the Dirac equation, operators and monogenics, the Hydrogen atom,
propagators and scattering theory, spin precession, tunnelling times, spin
measurement, multiparticle quantum mechanics, relativistic multiparticle wave
equations, and semiclassical mechanics.
