A knowledge engineer is a professional who is responsible for designing and developing knowledge-based systems that can resolve complex problems by using artificial intelligence and machine learning technologies. There are several synonyms for the term knowledge engineer, including cognitive engineer, intelligent systems engineer, and machine learning engineer. Other related terms for this profession include data scientist, expert system developer, and natural language processing specialist. These professionals work in various industries, such as healthcare, finance, and education, to create systems that can improve productivity, make more accurate predictions, and provide better solutions to complex problems. In summary, a knowledge engineer is an essential figure in the development and implementation of intelligent systems.