Tetragon's founders

About Us

TETRAGON Braille Systems GmbH is an Austrian spin-off from TU Wien (Vienna University of Technology). We started as an independent working group in 2017 and became a limited liability company in 2021. Our mission is to improve the lives of people with visual impairments by developing innovative technology.


Wolfgang Zagler (Dipl.-Ing. Dr.)
Accessibility Design

Wolfgang Zagler is a retired professor, who had his own working group for Assisting Technologies at TU Wien. He has decades of experience with Braille displays and was supervising two master theses in which the concept for our first product was developed. Even in his retirement he is eager to bring new assisting inventions to life.

Wolfgang Zagler on LinkedIn

Wolfgang Zagler

Michael Treml (Dipl.-Ing.)
Software Engineering

Michael Treml studied Media Informatics. He came up with the initial BrailleRing idea of combining grouped Braille dots in a rotating ring for his master thesis. Today he is working on his doctoral thesis in the field of technologically supported braille teaching.

Michael Treml on LinkedIn

Michael Treml

Dominik Busse (Dipl.-Ing.)

Dominik Busse studied Mechanical Engineering, where he specialized in Lighweight Structures and Applied Machine Elements. He is engineering and building prototypes for Tetragon since his master thesis.

Dominik Busse on LinkedIn

Dominik Busse

Mike Busboom (B.A.)
Braille Consultant

Mike Busboom is an expert in Braille reading and Tetragon's most important connection to the blind community, because he is blind himself. He has more than 20 years of experience in Braille display marketing and was also consulting Wolfgang Zagler's working group.

Mike Busboom

Other Team Members

Matthias Gerwinat (Ing. Mag.)
Managing Director

Matthias Gerwinat studied Industrial Engineering and Commercial Science. He has many years of experience as managing director and as a founder himself, and now he is also providing his experience to Tetragon.

Matthias Gerwinat on LinkedIn

Matthias Gerwinat

Andreas Dünser (B.Sc.)
Biomedical Engineering

Andreas Dünser studied Biomedical Engineering at FH Technikum Wien. He joined Tetragon in early 2018 to build prototypes and conduct user studies for his bachelor thesis. Currently he is studying for his master's degree in Innovation and Technology Management.

Andreas Dünser on LinkedIn

Andreas Dünser

Georg Ehrenfels

Georg Ehrenfels learned the job of a watchmaker and is an expert in precision mechanics. He was part of Wolfgang Zagler's working group and is involved in the assembly of our mockups and prototypes since early stages.

Georg Ehrenfels

Various Tasks

Our strong connections to TU Wien and other universities allows us to work with lots students who write their theses in the field of our expertise. While we cannot list all of them separately, we honor their work for Tetragon with this general entry.