  The subject of lepton-hadron scattering is discussed from its earliest
beginnings, concentrating on what we have learnt from the HERA electron-proton
storage ring. A brief selection of the HERA I results most relevant to LHC are
discussed. The HERA and ZEUS upgrades are outlined, together with the HERA II
physics programme. The impact of HERA results on LHC is discussed, in
particular in the areas of luminosity measurement, background estimates and
possible signatures of new physics. Finally, possible future developments in
lepton-proton physics beyond HERA II are discussed.
