Dr. Mobashers main research interest is focused on the study of formation and evolution of galaxies using multi-waveband galaxy surveys obtained with 8-10 meter ground-based telescopes (Gemini, VLT, Subaru, Keck) and space facilities (HST, Spitzer, GALEX, Chandra). Using the observational data and stellar synthesis models, he studies properties of galaxies as a function of star formation rate, morphology, environment, color, luminosity and redshift. Over the past two years he has been involved in the following studies: developing the Balmer Break technique for identifying very high redshift massive galaxies, using the combined HST and Spitzer data; discovery of an extremely massive and evolved galaxy at z ~ 7 (this has been the subject of extensive press release); study of the density-morphology relation over the largest dynamic range in density, and its evolution with redshift; planning and execution of the new Hubble Ultra Deep Field (HUDF), doubling the area and increasing the depth of the original HUDF; finding candidates for galaxies at z ~ 8 through searches for J-band dropouts in the new HUDF; study of the properties (SFR, mass, extinction) of high redshift galaxies selected through narrow-band Lyman emission (LAE) at z = 5.7 and comparison with Lyman Break Galaxies at the same redshift; developing a photometric redshift code to calculate redshift, spectral types and stellar masses of galaxies. He has been highly involved in the Great Observatories Origins Deep Survey (GOODS) and The Cosmic Evolution Survey (COSMOS) projects. Mobasher has also been leading parts of the new HST treasury project to survey the core and outskirt of the Coma cluster.