His thesis titled "Analysis of two-level grammars" was submitted and defended in Karlsruhe in 1977 with Hermann Maurer and Thomas Ottmann being the referees.

In 1982 he received the venia legendi in applied computer science from the University of Karlsruhe with an inaugural dissertation (Habilitationsschrift) on Quicksort variants for multisets.

Examiners were Thomas Ottmann, Wolfgang Janko and Jan van Leeuwen (Utrecht).

[3] In 1986 he authored an E-learning course "Introduction to Unix", which originally was a contribution to Hermann Maurer's COSTOC-Project, and with several portings was in active use until 2015, thus constituting one of the longest running examples of courseware.

Besides his scientific achievements Wegner was instrumental in introducing computer science studies (Bachelor and Master) at the University of Kassel which started in 2001 after securing three additional, sponsored professorships with Traudl Herrhausen, then a member of the Hessian Parliament, opening doors to industry and charities.