Alejandro K. Samhan-Arias is an Associate Professor and coordinator of the Master’s in Biotechnology in the Biochemistry Department of the School of Medicine, Universidad Autónoma de Madrid (UAM), and the Instituto de Investigaciones Biomédicas 'Sols-Morreale' (CSIC). He is dedicated to comprehending both the beneficial and harmful properties of free radicals and reactive oxygen and nitrogen species, with a particular focus on reactions occurring in biological membranes. His primary interests also encompass the physical biochemistry and structural biology of electron transfer proteins, particularly metalloproteins, whose function might be altered by specific microenvironments, such as those provided by specific lipid membrane domains. He has expertise in a multitude of biophysical and spectroscopic techniques.