Frank Drewnick is leading a research group in the Particle Chemistry Department at Max Planck Institute for Chemistry in Mainz. His research interests focus on various aspects of anthropogenic aerosol sources: source characteristics, transport and transformation of particles, and impact of emission sources on local air quality. For this purpose, a mobile aerosol research laboratory was developed in his group, which allows measurement of particle concentration and composition as well as of trace gases in real time. Before joining the MPI for Chemistry, Frank Drewnick worked at State University of New York in Albany, NY, USA from 2001 until 2002 where he performed early work on on-line aerosol mass spectrometry to investigate the urban aerosol in New York City. He received his PhD in 2000 at University of Hohenheim in Stuttgart on the development of an aerosol mass spectrometer.