Johannes was introduced to the secrets of computer graphics in Ulm University,
working on low level ray tracing optimisation, quasi-Monte Carlo point sets,
light transport simulation, and image denoising. The following ten years he
worked as a researcher for Weta Digital, first in Wellington, New Zealand,
later remotely from Germany. He is co-architect of Manuka, Weta Digital's
physically based spectral renderer. Since 2013, Johannes works as a
post-doctoral fellow at the Karlsruhe Institute of Technology. In 2009,
Johannes founded the darktable open source project, a workflow tool for RAW
photography. Johannes has a movie credit for "Abraham Lincoln: Vampire Hunter".