July 2006 – Present Professor of Construction Engineering and Management, - Faculty of Engineering, University of Waterloo, Waterloo, Ontario, Canada. 

July 2001 – June 2006 Associate Professor of Construction Engineering and Management, - Faculty of Engineering, University of Waterloo, Waterloo, Ontario, Canada. 

Aug. 2001 – Present President and founder of OPTEAM Inc (www.opteam.ca), a Waterloo-based company providing consultation, training, and software development for project management and infrastructure asset management. Opteam's software systems include BAL, EasyPlan, and EasyAsset systems.

Jan. 1997 – June 2001 Assistant Professor of Construction Engineering and Management, - Faculty of Engineering, University of Waterloo, Waterloo, Ontario, Canada.

May 1995 – Dec. 1996 Assistant Professor of Construction Engineering and Management, - Faculty of Engineering & Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada.

Aug. 1993 - May 1994 Limited-Term Assistant Professor of Construction Engineering and Management - Centre for Building Studies, Concordia University, Montreal, Canada.

Sept. 1992 - Dec. 1992 Course Instructor - Centre for Building Studies, Concordia University, Montreal, Canada. 

Aug. 1993 – Dec. 1996 President and founder of PROFIT Consultants, a Montreal-based company (Founded in Aug. 1993) providing construction management consultation and developing computer software programs to the construction industry, including the Bid Analysis Software (ProBID).

Sept. 1988 - July 1993 Teaching and Research Assistant - Centre for Building Studies, Concordia University, Montreal, Canada.

Oct. 1982 - Aug. 1988 Civil Engineer - Suez Canal Research Centre, Suez Canal Authority, Ismailia, Egypt. Duties included full responsibility of the Building Construction Division, involving a wide range of consulting work on methods of construction, field and laboratory quality control tasks, rehabilitation for constructed facilities, building materials, and constructability aspects for a wide spectrum of engineering projects including buildings, highways, and offshore structures.

1978, 1979 and 1980 Trainee for 4 months in each year, Civil Engineering Department, Penta Ocean Construction Co. Ltd. (Japanese Company) during the project of widening and deepening of the Suez Canal, Egypt.