Costanza Toninelli obtains her Master degree in Physics (30.09.2003), studying cold atoms clocks in the European Laboratory for NonLinear Spectroscopy (LENS). Her actual research activity concerns light propagation in complex systems, performing experiments both on ordered, quasi-periodic and completely disordered structures. Her experience includes work on 1 and 3 dimensional systems, focussing on the influence of disorder on photonic crystals. She is concluding her Ph.D at the European Laboratory for NonLinear Spectroscopy (LENS).