Ada Lovelace (nonfiction)

Ada Lovelace. Engraving circa 1838.

Augusta Ada King, Countess of Lovelace (née Byron; 10 December 1815 – 27 November 1852) was a British mathematician and writer, chiefly known for her work on Charles Babbage's early mechanical general-purpose computer, the Analytical Engine.

Her notes on the engine include what is recognised as the first algorithm intended to be carried out by a machine. Because of this, she is often regarded as the first computer programmer.