"He is a staff scientist, operational head of World Optical depth Research and Calibration Center (WORCC). Diploma from Federal Institute of Technology, Zürich (ETHZ) in experimental physics. Since 1978 staff physicist at PMOD working on spectral irradiance measurements and calibration, solar irradiance variability, atmospheric diagnostics by sunphotometry, development of onboard and groundbased software. Co-investigator of IPHIR experiment on PHOBOS, SOVA on EURECA, SOJA on MARS96 and VIRGO on SOHO mission. Co-leader of working group 1 of SOLERS22, Member of the Optical Society of America. His current projects are -implementation and operation of the GAW aerosol optical depth network with Precision Filter Radiometers -radiometric laboratory and extraterrestrial calibration of filter radiometers -instrument CoI for VIRGO experiment on SOHO and SOVIM experiment on SSI spacecrafts -optical design of PREMOS instrument on PICARD and radiometers on LYRA satellites -evaluation and scientific interpretation of narrowband spectral measurements -coordination of computer administration at PMOD/WRC.

Atmosphere, radiation, Methods, Data Collection - Measurement, Data Analysis