William McLellan (nanotechnology)

William Howard McLellan (December 1, 1924 – September 30, 2011) was an American electrical engineer.
In December 1959, Nobel Prize-winning physicist Richard Feynman offered two challenges relating to nanotechnology at the annual meeting of the American Physical Society, held that year at Caltech, offering a $1000 prize to the first person to solve each of them. The first one required someone to build a working electric motor that would fit inside a cube 1/64 inches (0.40 mm) on each side. McLellan, at that time living nearby, achieved this feat by November 1960 and won the prize; his 250-microgram 2000-rpm motor consisted of 13 separate parts.
The prize for the second challenge was claimed only much later, by Tom Newman in 1985.