Oscar completed his PhD about spin transport in ferromagnets and carbon nanotubes at Trinity College Dublin in 2005. He then moved to the French Alternative Energies and Atomic Energy Commission (CEA-Saclay, France) to do research on atomic break junctions as a postdoctoral research engineer. Later, he was a visiting scientist and JSPS postdoctoral fellow at Kyushu University in Fukuoka, Japan, working on biomagnetism and the effects of RF magnetic fields in proteins. He joined the University of Leeds in 2009 to develop new research in molecular spintronics, becoming Professor of Condensed Matter Physics in 2021. Oscar has extensive experience measuring magnetic materials that include thin films, interfaces and multilayers, textiles, magnetic inks, spin crossover and single molecule magnets, spin glasses and frustrated systems, proteins, biocrystals, metal and oxide nanoparticles, rare-earth based magnets and many others.