Wide field of view optical IFUs are allowing large and efficient studies of spatially resolved nearby galaxies and large samples of emission line selected galaxies at high redshift. In this talk I will present a collection of results regarding the properties of galaxies at different redshifts from studies conducted using the Mitchell Spectrograph (a.k.a. VIRUS-P) IFU. In particular, I will discuss observations of nearby spiral galaxies taken as part of the VIRUS-P Exploration of Nearby Galaxies (VENGA), and [OII] emitters at 0<z<0.5 and Lyman-Alpha emitters at 1.9<z<<3.8 selected as part of the HETDEX Pilot Survey.