Daniel Schläpfer received the M.Sc. degree in geography and atmospheric physics and the Ph.D. (Dr.Sc.Nat.) degree in remote sensing from the University of Zürich, Zürich, Switzerland, in 1994 and 1998, respectively, and the Teaching Professor degree from the Education Department of Canton, St. Gallen, Switzerland, in 2009. From 1998 to 2008, he was a Research Scientist with the Remote Sensing Laboratories, University of Zürich. He is currently with ReSe Applications LLC, Wil, Switzerland, a company he founded in 2000 and he still holds. Furthermore, he holds a physics teaching position with Kantonsschule, Wil (Junior College). His research interests include the geometric preprocessing of airborne scanner data on the basis of the PARGE software, the application of radiative transfer models in imaging spectroscopy, and the advancement of radiometric and atmospheric compensation in the framework of the ATCOR and DROACOR atmospheric correction solutions, and advancing radiometric processing further with development of BRDF correction methods (BREFCOR).