John Conway, mathematician and creator of Conway's Game of Life, has apparently
died of Coronavirus aged 82.
There's a long profile of him from a few years ago
here. My knowledge of him only really comes from the Game of Life, which is a set of rules for a cellular automaton (almost bitterly ironically, one of the key rules being "a cell with too many live neighbours is overcrowded and dies"). But he had a lot of other mathematical achievements, most of which I'm too tired and not enough of a mathematician to get my head around.
You can find an implementation of the Game of Life
here.