Darío A. Arena received his Ph.D. in experimental surface physics from Rutgers University, New Jersey. After postdoc work at Lawrence Livermore National Laboratory, California, and the Naval Research Laboratory, Washington D.C., he was employed as a physicist and beam line scientist at Brookhaven National Laboratory, New York, specializing in x-ray spectroscopy of magnetic materials. He is a Fulbright Scholar and is currently an Associate Professor at the Department of Physics at the University of South Florida. His research interests are in nanomagnetism and spin dynamics.