From 1998 to 1999, he joined the laboratory of Christof Koch at California Institute of Technology as a postdoctoral fellow to investigating the characteristics of temporal processing and feature integration. In 1999, he went to work as a senior researcher with Manfred Fahle at the section of Human Neurobiology at the University of Bremen where he was project leader at the Center of Excellence 517 on "Neurocognition" that was funded by German Research Council (DFG). In 2003 he became a professor for neurobiopsychology at the Osnabrück University for one year.
