The book "Biomedical EPR - Part A: Free Radicals, Metals, Medicine and Physiology" offers a comprehensive introduction to the applications of electron paramagnetic resonance (EPR) spectroscopy, particularly in the fields of free radicals, metals, medicine, and physiology. It was published in honor of Prof. James S. Hyde's 70th birthday, a prominent scientist in this field. The individual chapters are designed to be beneficial for both beginners and experienced researchers. They provide foundational information and introduce current overviews that illuminate the wide range of questions that can be addressed by EPR. With a clear focus on the practical applications and theoretical foundations of EPR techniques, this specialized book is a valuable resource for students and professionals dealing with the biological and medical aspects of radicals and metals.