a Search for Excited Electrons in Electron-Proton Collisions at Hera.

We have performed a search for excited electrons using the ZEUS detector at HERA which provides collisions between 26.7 GeV electrons on 820 GeV protons. In a sample of 550 nb^{-1} integrated luminosity, no evidence was found for any resonant state decaying into e^-gamma, nu W^-, or e^-Z^0 (e^* decay modes). Background from deep inelastic scattering and photoproduction is small and consistent with Monte Carlo calculations. Limits on the coupling strength of an excited electron will be presented for masses above 40 GeV/c^2 at the 90% confidence level. Due to the large center of mass energy of HERA (296 GeV) this analysis significantly extends the region within which one can search for excited leptons compared to previous searches at LEP.