I work with Vittorio Ferrari on human-machine collaboration for large scale image annotation for both object detection and image segmentation. I received my PhD in 2012 from the University of Saarland under supervision of Prof. Dr.-Ing. Philipp Slusallek, working on real-time ray tracing and global illumination for commodity hardware. I did a postdoc (2012-2014) at INRIA Sophia Antipolis (France) under the supervision of George Drettakis. I worked on photo-realistic rendering in cooperation with Fredo Durand (MIT) and Ravi Ramamoorthi (UC Berkley). I joined Google in 2014 and worked on SafeSearch until 2016.