Herbert Waldmann obtained his Ph D in organic chemistry from the University of Mainz, Germany, in 1985 working with Professor H. Kunz, after which he completed a postdoctoral appointment with Professor G. Whitesides at Harvard University (USA). He was appointed as Professor of Organic Chemistry at the University of Bonn (1991), full Professor of Organic Chemistry at the University of Karlsruhe (1993), and Director at the Max-Planck-Institute of Molecular Physiology Dortmund and Professor of Organic Chemistry at the University of Dortmund, Germany, in 1999. He has received numerous awards, e.g. the Otto-Bayer-Award (2001), the Max Bergmann Medal (2003), and recently the Emil-Fischer-Prize (2012). His research interests lie in bioactive compound development, target identification, and the chemical biology of Ras proteins. Petra Janning studied chemistry at the University of Munster, Germany, and did her Ph D thesis at the Institute for Analytical Sciences in Dortmund, Germany in 1995. After different positions where she worked in the area of analytical chemistry and on the borderline between chemistry and biology she joined the Max-Planck-Institute of Molecular Physiology, Dortmund, in the department of Professor H. Waldmann, where she is currently working. She is responsible for the Bioorganic Practical Course and the analytics in the department. She focused her work on mass spectrometry based methods in proteome research in particular in target protein identification of small molecules.