Geertruida de Haas-Lorentz
Geertruida Luberta de Haas-Lorentz (née Lorentz; 20 November 1885 – 1973) was a Dutch theoretical physicist and a professor at the Technical University of Delft. She was the first to theoretically study thermal fluctuations in electric circuits, treating electrons as Brownian particles.
Source: Wikipedia — Geertruida de Haas-Lorentz (CC BY-SA 4.0)