The Woman Behind the Face
Lovelace is commonly credited as the first computer programmer, owing to an algorithm she wrote for Babbage's Analytical Engine. There is some controversy surrounding this claim, but while the title of first programmer may be in question, the fact that she was a significant part of Babbage’s work, and a pioneer of early theoretical computing, is unassailable.
She was also a bit of a dilettante who dabbled in many fields of the day. Her interests included mathematics and physics, but also some other stranger pseudo sciences, like mesmerism, and phrenology.
Check out Ada Lovelace's Wikipedia page for a thorough description of her accomplishments and contributions.