K. Eric Drexler is an American engineer and nanotechnology pioneer, best known for his work in molecular nanotechnology. He gained prominence with his 1986 book, Engines of Creation, which introduced the concept of building machines at the molecular level, potentially revolutionizing various fields, including medicine and manufacturing. Drexler founded the Foresight Institute, an organization dedicated to promoting the responsible development of nanotechnology. His ideas have sparked discussions about the ethical implications and potential risks associated with advanced technologies, making him a significant figure in the ongoing dialogue about the future of science and technology.