In Memoriam of Professor Yavuz Basar On August 30, 2002, our highly-esteemed colleauge, friend and mentor, Prof. Yavuz Basar, died suddenly and unexpectedly. He leaves behind his wife Emine and his two sons Emre and Eray. Due to Yavuz Basar’s sudden death, Ruhr University Bochum and the whole international scientific research community in the area of computational mechanics lose one of their outstanding scientists and researchers. He greatly enjoyed science and was very productive up until the end. Many new plans were jointly developed only recently at our institute. His four published books and more than 130 publications earned Yavuz Basar a highly-esteemed reputation world-wide in the field of computational mechanics and, in particular, in the field of numerical analysis of shell structures. Yavuz Basar was born on March 15, 1935 in Istanbul. After graduation from the Galatasary High School in Istanbul he studied at the Swiss Federal Institute of Technology in Zurich. There, he obtained his diploma in civil engineering in 1960. Four years later, he achieved his doctoral degree at Hannover University with a Ph.D. thesis on the numerical analysis of shell structures. Together with his highly-valued teacher, Wolfgang Zerna, he changed to Ruhr University Bochum in 1969. There, he obtained his professor title in 1973. Five years later, in 1978, he held a professorship at Technical University Istanbul. Yavuz Basar taught at universities in Germany, France, Italy and Turkey. However, with the exception of a short period as professor and director of the Institute for Structural Mechanics at Yildiz University Istanbul, he always remained loyal towards Ruhr University Bochum, where he was engaged in scientific research and taught as a professor since 1983. He was an outstanding teacher who put forth great effort for his students. Especially for his diploma and doctoral students he most often was more a father-like mentor, far beyond just being a teacher. Scientific excellence and high ethical standards were deeply integrated in Yavuz Basar’s personality. His opinions and his advice were always positive, of great tolerance and integrity. He was always an honest and trustworthy partner. Some of us even had the opportunity to get to know Yavuz Basar as an admirer of the fine arts who was fond of music, paintings, literature – and who, from time to time, even produced essays and lyrics himself. The Institute for Structural Mechanics deeply mourns over a very special colleague and teacher. We will always remember him with great respect. Our cordial sympathy rests with his familiy. The staff members of the Institute for Structural Mechanics