Humberto Maturana Romesín (September 14, 1928 – May 6, 2021) was a Chilean biologist and philosopher. Many consider him a member of a group of second-order cybernetics theoreticians such as Heinz von Foerster, Gordon Pask, Herbert Brün and Ernst von Glasersfeld, but in fact he was biologist, scientist. wikipedia 
See Der Frosch, die Fliege und der Mensch (translated from German into English) – On the death of Humberto R. Maturana (September 14, 1928 – May 6, 2021) by Dirk Baecker.