Professor Helmi A. A. Youssef , born in August, 1938 in Alexandria, Egypt, acquired his B.Sc. degree with honor in Production Engineering from Alexandria University in 1960. He completed his scientific building in the Carolo-Welhelmina, TH Braunschweig in Germany during the period 1961-1967. In June 1964 he earned his Dipl.-Ing. degree, then in December 1967, he completed his Dr.-Ing. degree in the domain of Non-traditional Machining. In 1968, he returned to Alexandria University, Production Engineering Dept. as an assistant professor. In 1973was promoted to associate, and in 1978 to full professor. In the period 1995-1998, professor Youssef was the chairman of the Production Engineering Dept., Alexandria University. Since 1989, he has been a member of the scientific committee for promotion of professors in Egyptian universities. Between 1975 and 1995, Professor Youssef was a visiting professor in El-Fateh University in Tripoli, the Technical University in Baghdad, King Saud University (KSU) in Riyadh, and Beirut Arab University (BAU) in Beirut. He established laboratories, and supervised many M.Sc. and Ph.D. theses. Professor Youssef has organized and participated in many international conferences. He has published many scientific papers in specialized journals. He has co-authored many books in his fields of specialization, and has been the single author of two books. One book, co-authored on Machining Technology, has been published in 2008 by CRC, USA. Currently, he is an emeritus professor in PED, Alexandria University.Professor Hassan El-Hofy was born in 1953, in Egypt. He received a B. Sc Honors degree in Production Engineering from Alexandria University in 1976, and then served as a teaching assistant in the same department and received a M. Sc. in Production Engineering from Alexandria University in 1979. Following M. Sc., he worked as an assistant lecturer until October 1980 when he left to Aberdeen University i
