Brandl is most well known for his self-labeled "mongrel art": hybrids of installation and sequential paintings and drawings, which occasionally incorporate lectures as performances.

[3] Brandl is active internationally as an artist since 1980, has won various awards, had many publications and had numerous exhibitions.

[6] Due to his participation in these publications and his many exhibitions, Brandl has become highly visible in the Chicago and New York art worlds, as well as in Europe.

'[8] Brandl’s philosophy book for Bloomsbury Press for the "Aesthetics and Contemporary Art" Series (David Carrier and Tiziana Andina, editors), titled A Philosophy of Visual Metaphor in Contemporary Art was published in 2023.

A book titled Covering Brandl, on 22 years of essays about his art by the author and theorist Daniel F. Ammann was published in 2020 by Magoria Press.