HAPPEX parity violation experiments at Jefferson Lab

The HAPPEX program of measurements of parity-violation in elastic electron scattering, in Hall A of Jefferson Lab, is presented. The results of the recently completed measurement on the proton at Q(2) = 0.48 GeV2 are briefly reviewed. The plans are presented for the upcoming HAPPEX II measurement on the proton at Q(2) = 0.1 GeV2, as well as the companion measurement with a He-4 target at the same momentum transfer. These experiments are sensitive to strange quark contributions to the vector structure of the nucleon. The two new experiments will provide a precision measurement of the strangeness radius parameter, and the combination of the two experiments will also determine the strange contribution to the proton's magnetic moment.