Dr. Horst Zimmermann is professor for Electronic Circuit Engineering at TU Wien, Vienna, Austria since 2000. His main interests are in design, characterization of analog and nanometer CMOS circuits, optoelectronic integrated CMOS and BiCMOS circuits, as well as optical wireless communication, in single-photon detection and in electronic-photonic integration. He is author and co-author of more than 600 publications. In 2002 he became Senior Member IEEE. He was primary guest editor of the Nov./Dec. 2014 issue of IEEE J. Selected Topics in Quantum Electronics on Optical Detectors: Technology and Applications.