Alberto P. Guimarães is an Emeritus Researcher at the Centro Brasileiro de Pesquisas Físicas (CBPF) in Rio de Janeiro and is a specialist in magnetism. He obtained his Ph. D. at the University of Manchester, England. He is the author of the books Principles of Nanomagnetism, Springer, 2nd edition (2017), From Lodestone to Supermagnets: Understanding Magnetic Phenomena, Wiley-VCH (2005), and Magnetism and Magnetic Resonance in Solids, John Wiley (1998). Published in Portuguese: Introdução ao Magnetismo (2022), Forças de Atração (2021), A Pedra com Alma (2011), Magnetismo e Ressonância Magnética em Sólidos (2009).