Esteban Terrades i Illa (15 September 1883, in Barcelona – 9 May 1950, in Madrid) also known as Esteve Terradas, was a Spanish mathematician, scientist and engineer. He researched and taught widely in the fields of mathematics and the physical sciences, working not only in his native Catalonia, but also in the rest of Spain and in South America. He was also active as a consultant in the Spanish aeronautics, electric power, telephone and railway industries. Education and academic career He held two doctorates (in mathematics and physics) on 1904, as well as two degrees in engineering, from the ETSEIB school. He was professor of mathematical analysis (teaching differential equations) and later of mathematical physics at Barcelona Central University. He also taught acoustics, optics, electricity, magnetism and classical mechanics at the University of Barcelona, teaching mechanics also at the University of Zaragoza, University of Buenos Aires and the University of La Plata (Argentina) and Montevideo (Uruguay). He was a Member of the Royal Academy of the Spanish Language and active in the Royal Academy of Exact, Physical and Natural Sciences and the Royal Academy of Sciences and Arts of Barcelona. He was granted honorary doctorates by the Universities of Buenos Aires, University of Santiago (Chile) and University of Toulouse (France) and established as an honorary member of the Royal Academy of Medicine of Barcelona, the Association of Argentine Engineers, and of the Society of Engineers of Peru among many other honors. He was an Invited Speaker at the ICM in 1912 in Cambridge, England. He studied at Charlottenburg in Berlin, Barcelona and Madrid. Known as an exceptional student, entered the University in 1898, when was only 15 years old. He held professorships in the universities of Zaragoza, Barcelona and Madrid, specializing in physical and mathematical sciences and publishing numerous articles about those subjects. In 1909, while at the Academy of Sciences and Arts of Barcelona, he produced an important work entitled Emisión de radiaciones por cuerpos fijos o en movimiento. His teaching and pedagogical activity was also important. He published articles in the "Revista de la Academia de Ciencias" in Madrid, and in the bulletin of the Institute of Sciences of Barcelona. He set up a physics-mathematics seminar, to which he brought some of the best regarded scientists of his time. He became a founding member of the Sciences Section of the Institute of Catalan Studies in 1911, within the