Prof. Wernstedt studied weak-current engineering with the main subject control engineering at the Technical University of Ilmenau from 1958.
After his doctorate in 1969 and his appointment as university lecturer for "Automatic Control Modelling" in 1972, he established the teaching and research group "Process Analysis and Process Control" at the Institute of Control Engineering of the Section Technical and Biomedical Cybernetics.
In 1978 he completed his habilitation. From 1983 to 1985 he worked as project manager "computer-aided process control" for the production of highly integrated circuits at VEB Mikroelektronik Erfurt. In 1985 he was appointed full professor at the TH Ilmenau for the field of "system analysis". From 1993 to 1996 Prof. Wernstedt held an honorary professorship "Knowledge-based Systems in Robotics" at the Technical University of Vienna and at the same time worked at the Lower Austrian State Academy in Krems.
In 1996 he was appointed as C4 professor for the subject area "System Analysis" at the TU Ilmenau. At the same time, he took over the management of the newly founded "System Technology" Ilmenau Application Center of the Fraunhofer Institute for Information and Data Processing Karlsruhe (IITB), which he continues to head. He was co-founder and first managing director of "System Engineering GmbH Ilmenau".
During his apprenticeship he represented the complexes "Control and Systems Engineering", "Process Analysis", "Systems Analysis", "Modeling", "Fuzzy Control", "Knowledge-Based Systems", "Decision Support Systems" and "Human-Technology-Environment".
In numerous research projects, the Department of Systems Analysis has been involved in the computer-aided acquisition, selection and processing of information (data analysis) as well as in the creation of mathematical-cybernetic models for signals and systems with the aim of creating the conditions for prediction and decision making as well as the development and implementation of decision proposals and strategies for the design, diagnosis, control/guidance and planning of complex processes in technical and non-technical areas.
He wrote the textbooks "Experimental Process Analysis" (1989) and "Fuzzy Control" (1996).
During his work, Prof. Wernstedt supervised 39 doctoral theses and led 5 scientists to their habilitation.