The author likes to thank all members of the HERA-B target group for the enormous work they did. A cordial thanks to Thomas Lohse for providing his detailed knowledge, the simulation tools and his cooperation to resume, explain and discuss target related topics. A special thanks to the HERA shift crew and especially to F. Willeke and M. Seidel for all their support and the friendly collaboration. Thanks to the other HERA experiments for accepting us as the fourth HERA experiment. This work was supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie under the contract number 057DO55.