In the 1960s and 1970s he developed the PLATO computer system, which combined instant messaging, e-mail, chat rooms and games on flat-panel plasma screens.
The Lithuanian National Opera House had stopped screening Tchaikovsky's 1892 masterpiece in solidarity with Ukraine during its war with Russia. Then a new minister expressed affection for the Russian composer, sparking a controversy.
President-elect Donald Trump is tapping the tech sector for key roles, and executives at venture capital firm Andreessen Horowitz are heavily featured.