Kardashev

Nikolai Semyonovich Kardashev was a Russian astronomer most famous for  writing “Transmission of Information by Extraterrestrial Civilizations” in 1964 that includes the origin of what id known as the Kardashev Scale of civilizations levels 1 to 3.

Borne in Moscow on the 25 April 1932 he had a very illustrious long career up to his death at 87 on the 3 August 2019.

Also wrote in 1985 "On the Inevitability and the Possible Structures of Supercivilizations"

He also proposed Very Long Baseline Interferometry (VLBI),