Granville Woods was 10 when he began working at a machine shop, while continuing his studies at a night school. He grew up to become a steam locomotive engineer and earned the nickname the Black Edison for his countless inventions, most of which were related to electrical systems for railways.
Ophthalmologist Patricia Bath is remembered for her pathbreaking invention of the Laserphaco Probe, which made laser cataract surgery possible. The first Black female surgeon at the UCLA Medical Center and the first female faculty staff of the UCLA Jules Stein Eye Institute, she dedicated her life to curing blindness.
Ventilation, heating system, and air conditioning pioneer David Crosthwait was one of the first African-American men to excel in science. Throughout his illustrious career, he managed to gain 80 international patents. He later taught at Purdue University and was presented with an honorary doctorate by the same university.