Lucien Wald graduated in theoretical physics at University of Aix-Marseille II and University of Paris UPMC, France, in 1976-1977. He obtained a Ph.D. degree in 1980 at University of Paris UPMC on infrared remote sensing of the ocean. He joined MINES ParisTech in Sophia Antipolis in 1980. He obtained the Doctorat d'Etat ès Sciences degree in 1985 on the applications of remote sensing to oceanography. He has been a Professor at MINES ParisTech since 1991. He focused his own research in applied mathematics, data fusion, and meteorology and solar radiation. He obtained the Autometrics Award in 1998 and the Erdas Award in 2001 for articles on data fusion. His career in information technologies was rewarded in 1996 by the famous French Blondel Medal. He contributed to the development of the series of the Heliosat methods for assessing solar radiation from satellite images. He set up a team for operating these methods daily and producing the series of the HelioClim databases. He retired in June 2018.