Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Christoph Cremer (born in Freiburg im Breisgau, Germany) is a German physicist and professor at the Ruprecht-Karls-University Heidelberg, who has successfully overcome the conventional limit of resolution that applies to light based investigations (the Abbe limit) by a range of different methods (1971/1978 development of the concept of 4Pi-microscopy; 1996 localization microscopy SPDM; 1997 spatially structured illumination SMI).