I was an inventor and engineer, creating the first steam engine/steam turbine, the first windwheel (producing power by harnessing the wind), and the first "coin-operated" vending machine.
I taught at the famous Library of Alexandria, where my writings appeared as lecture notes for courses in mathematics, mechanics, and physics.
As a side line, I used my mechanical ingenuity to create devices priests could use in temples to instill faith in non-believers with deceiving "magical acts of the gods."
Published in my Metrica, I am best known for my formula for calculating the area of a triangle using only the three side lengths (sans trig).
I was interested in all forms of mensuration--mathematics, physics, and optics--being the first to prove geometrically the law of reflection for light rays.
Heron of Alexandria (ca. 10-70)