John Ambrose Fleming was an English scientist who made groundbreaking innovations in electrical engineering.
Henry Frick was an industrialist who headed the Carnegie Steel Company and the United States Steel Corporation. His mansion later became the Frick Museum.
Russian physiologist Ivan Petrovich Pavlov studied "conditioned reflex" through an experiment that made hungry dogs salivate at the sound of a dinner bell.
Terence Powderly served as union leader of the Knights of Labor from 1879 to 1893. Under his leadership, the union saw both unprecedented growth and sudden decline.
William Thomas Stead was a writer of journalistic pieces and ghost stories whose life came to an end on the Titanic.