Who discovered nanotechnology?

Nobel-prize-winning physicist Richard Feynman gave a lecture titled "There's Plenty of Room at the Bottom" on December 29, 1959 at an American Physical Society meeting at Caltech. It considered the possibility of direct manipulation of individual atoms, and is widely regarded as a milestone in the development of Nanotechnology.

Practical nanotechnology started in the 1980s with the development of atomic force microscopes, which are capable of manipulating individual atoms.

K. Eric Drexler published Engines of Creation: The Coming Era of Nanotechnology in 1986, expanding on the concepts of nanotechnology, and laying out a hypothetical roadmap to achieve it.