Wilhelm Schwenk, Ph.D., was with the Research Institute of Mannesmann AG in Duisburg and was engaged in the field of corrosion and corrosion protection. Since retiring in 1994, he has been a consultant and member of numerous technical associations and committees. He has been a lecturer at the Technical University in Aachen since 1970. Professor Schwenk is the author of several text books and many scientific and technical papers.