We analyze the scientific work done by Jaume Raventós (1905-1982) preceded by a brief biographic profile. The work of this Catalonian investigator has been separated into two stages: The first one, called the Barcelona period, is the training phase and comprises three moments: during the first one (1925-1927) the scientific participation of Raventós is still marginal; during the second period (1928-1933) he began to collaborate in large projects with A. Pi Sunyer and F. Doménech Alsina; and during the third period (1932-1934) he developed its own experimental line that culminated with his Doctoral Thesis. The second stage, called the British period, includes all work done during his exile at the United Kingdom. This phase can also be divided into three periods: the first one (1936-1939) took place in Edinburgh and was characterized by a continuation of the scientific line initiated in Barcelona; the second period developed in Manchester (1939-1954) and includes the studies with intravenous barbiturates; the third period (1956-1965) encompasses the last years of Raventós investigative activity which was devoted to the study of fluothane a new volatile anesthetic agent.