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He spent several years as a post doctoral fellow at the University of North Carolina at Chapel Hill and the Catholic University of America in Washington, DC in the U.S. and at the Centre de la Recherche Scientifique in Paris, France. Weiler’s career includes applied research, engineering and manager of information technology of a German multinational chemical company.
During his professional activities, mainly as an ICT-manager at Bayer Antwerpen N.V., he was elected president of the Royal Flemish Engineers Association (K VIV), counting 11.000 academic engineers. He was long time active founder-president of different technological working groups and president of several international symposia, conferences and the World Congress on Filtration.
Weiler has lectured at different universities and taught at the University of Leuven about the relationship between technology and society for last-year students in engineering and doctoral students.
Weiler actively participated in the World Summit on the Information Society (WSIS) in Geneva and Tunis, with a variety of initiatives centered on ICT and Education. He is a former member of the Advisory Board of the Wikimedia foundation 
- Global Sustainability: The Impact of Local Cultures, A New Perspective for Science and Engineering, Economics and Politics. p. XXIV.
- Statement of the Club of Rome to the World Summit on the Information Society, Geneva, 2003 "Towards a New Age of Information and Knowledge for All" in PDF
- "Director-General Opens a World Conference on Information and Communication Technologies for Capacity-Building: Critical Success Factors" UNESCO Press Release dated 13-05-2005