The dream of forming images of the interior of the proton was long thought to be intrinsically impossible. Deeply virtual exclusive processes, for example e+p --> e+p+γ, are sensitive to a new set of matrix elements called Generalized Parton Distributions (GPDs). The GPDs combine the information of elastic form factors and deep inelastic parton distributions. The GPDs provide a tomographic image of a proton (or nucleus): determining the spatial distribution of quarks and gluons in the transverse plane, as a function of their longitudinal momenta. I will review recent conceptual and experimental progress in developing images of the proton, as well as prospects for the 12 GeV era at Jefferson Lab.
Argonne Physics Division Seminar Schedule