| 11/62 - 11/67 | Study of Civil Engineering at the Technical University Munich |
| 11/67 - 12/73 | Assistant at the Department of Concrete Structures, Technical University Munich |
| 04/74 | Promotion at Technical University Munich Subject: "Influence of Concrete Cover and Crack Widths on Corrosion of Steel in Concrete" |
| 01/74 - 07/85 | Head of the Department "Practical Application" at the Institute for Reinforcing Steel e.V. in Munich and Deputy Director of the Institut |
| 08/85 - 03/98 | Chair for Building Materials and Director of the Institue for Building Materials at the Technical University of Aachen (RWTH Aachen) |
| 10/93 - 12/99 | Copartner of Bauingenieursozietät Aachen (BIS), then Copartner Engineering Office Schießl-Raupach-Consulting-Engineering, Aachen |
04/98 - 09/08 | Chair for Building Materials and Director of the Institue for Building Materials at the Technical University of Munich |
| ab 01.03.2000 | Partner of Engineering Consultancy Prof. Schießl, München,
since 01.07.2007 Partner of Engineering Consultancy Schiessl Gehlen Sodeikat GmbH |
| 07.11.2003 | Bestowal of Honory Doctorate of the Bauhaus-Universität Weimar |
28.04.2005 | Bestowal of the Emil Mörsch Denkmünze |
20.11.2007 | Bestowal of the Swedish Concrete Award 2007 |
