Prof.Popescu got her PhD in Max-planck-instutute for  nuclear physics in 1996, then  she worked in Max-planck-institute for  astronomy and in Max-planck-instutute for  nuclear physics as postdoc. Since 2017 she worked in university of central Lancashire (UCLan) as a full professor  in astrophysics. She is the  pioneer expert in the field of self-consistent modelling of the panchromatic spectral energy distribution of galaxies, and has published more 100 papers in the refereed journals with a H-index of 55. She also serves as the vice-president of IAU Division J (galaxies and cosmology) since 2021. Knowledge of the output and three dimensional distribution of all constituents of galaxies, stars of all ages, gas, dust, and cosmic rays, is a pre-requisite for understanding the process of star formation along the cosmic time, and ultimately the formation and evolution of galaxies. However, what we observe is the signature of the various galactic components, in terms of mainly photons of various energies. Thus, we measure the spatial and spectral energy distribution (SED) of galaxies which, ideally, should be modelled and converted into intrinsic properties of galaxies. From a pure mathematical point of view, this is equivalent with solving an inverse problem in a highly inhomogeneous medium, involving highly anisotropic processes that operate at multiple scales. In this talk I will show that radiative transfer models are powerful tools in solving this inverse problem and I will review past and recent progress in this field. In particular I will present our recent results on modelling the Milky Way and nearby face-on galaxies.