Ludwik Fleck, born on July 11, 1896, and died on June 5, 1961, was a philosopher and sociologist known for his sociological analysis of scientific knowledge. As a【identity positioning】interdisciplinary researcher, Fleck's work integrated philosophy, sociology, and medicine. In terms of【biography】, he received his education in Germany and the United Kingdom and served as a doctor during both World Wars. His medical background provided practical experience for his later sociological research on science. Fleck's main contributions,【achievements and contributions】, include the concepts of 'normal science' and 'anomalous science', as well as the theory of social construction of scientific knowledge. His book 'The Genesis and Development of Scientific Knowledge' deeply explored the nature of scientific knowledge and the social structure of scientific practice. Fleck's work has had a profound impact on the fields of science studies, philosophy of science, and cognitive science, and is widely regarded as one of the most important sociologists of science in the 20th century.