Yes, yesterday's mystery person was Guglielmo Marconi, who is generally remembered as the inventor of the radio and wireless communication. I say "generally remembered" as others could equally lay claim to that distinction. There were many people working on this at the same time, and the actual inventor could be disputed. Certainly Tesla played a large role, and the work in creating a working radio relied on the theoretical and practical work of innovators going back at least a hundred years.
Today's picture is from 1940, and shows a father and his daughter listening to an old radio. The picture was taken in California.