Rózsa Péter was one of the pioneers of recursive function theory. I wrote a short post about her for Ada Lovelace Day in 2010. More recently, I’ve found this nice reminiscence/bio by Béla Andrásfai, a Hungarian graph theorist and Péter’s adoptive son. I managed to track down one of his daughters, Eszter, who was so very kind to track down some pictures of Péter, one of which can be seen above. Many thanks, Eszter!