Magnetism plays an important role in biology, either through the development of MRI (Magnetic Resonance Imaging) contrast agents for imaging of biological tissues, or through the role of inRuencing the sensory mechanisms involved in the migration of thousands of organisms by using subtle changes in magnetic Keld: magnetoreception. We study the fundamental mechanisms involved in these processes through the lens of magnetism. Projects in this area involve the development of new contrast agents, new small molecules for sensing small molecule biological actors ( i.e. glutathione in the cell); and model studies to understand the fundamental mechanisms in nanoparticle and radical-mediated magnetoreception.