The Spanish psychologist Miquel Siguan wrote in his biography that he never considered himself a psychologist in the strict sense (Siguan, 1984). He had a broad intellectual background and both entertained a constant interest and worked in different fields including philosophy, sociology, history and pedagogy. During his career, he would become one of the key figures in the history of psychology in Spain. He was part of a small group of psychologists who managed to institutionalize the discipline in the country after the Spanish Civil War (1936-39). In 1962 he became Professor of Psychology at the University of Barcelona and in the years that followed he was decisive in establishing and designing the degree in psychology at that university. At the beginning of his career he published on migration within post-war Spain, industrial psychology, and projective tests. Yet today, his later work on bilingualism is more widely known, especially among psychologists and psycholinguists. Throughout his life, Siguan contributed significantly to psychology in Spain, which was going through a disrupted and decisive period in its history. This article contains: a short, contextualized biography; a presentation of some of Siguan’s early contributions during the Franco regime and an overall assessment of his approach and personal memoir of this historical figure.