This will be the 4th volume of a LIGHT SCATTERING REVIEWS series devoted to current knowledge of light scattering problems and both experimental and theoretical research techniques related to their solution. This volume will cover experimental studies in the optics of light scattering media, focusing on single light scattering and radiative transfer.Dr Alex Kokhanovsky graduated from the Physical Department of the Belarusian State University in Minsk (Belarus) in1983 and for the last two decades he has worked in the Laboratory of Light Scattering Media Optics in the Institute of Physics in Minsk. He is currently working with the SCIAMACHY algorithm development team at the Institute of Environmental Physics in Bremen (Germany). The main thrust of the research is the development of new cloud retrieval algorithms for water and ice clouds as seen by the spectrometer SCIAMACHY (in space from 2002). He is the editor of the first three volumes in this series, Light Scattering Reviews 1, 2 and 3, and is the author of several Springer Praxis books, including Light Scattering Media Optics (1999, 2001, 2004), Polarization Optics of Random Media (2003) and Cloud Optics (2006)