George Henry Corliss (June 2, 1817 – February 21, 1888) was an American mechanical engineer and inventor, who developed the Corliss steam engine, which was a great improvement over any other stationary steam engine of its time. The Corliss engine is widely considered one of the more notable engineering achievements of the 19th century. It provided a reliable, efficient source of industrial power, enabling the expansion of new factories to areas which did not readily possess reliable or abundant water power. Corliss gained international acclaim for his achievements during the late 19th century and is perhaps best known for the Centennial Engine, which was the centerpiece of the 1876 Centennial Exposition in Philadelphia.