Re: Here Here!
The cathode follower is a particular vacuum tube amplifier (or more accurately, amplification stage) configuration, but by no means the only possible vacuum tube configuration capable of amplification.
Blumlein, genius though he was, was born too late to have "invented electronics", something with which no one person can be solely credited anyway.
But as long as we're talking about genius electronics pioneers who aren't as well known about as they should be, allow me to mention the guy who got patent trolled by RCA and AT&T
and to recommend a biography of him
Man of High Fidelity: Edwin Howard Armstrong
by Lawrence Lessing
The high fidelity part refers both to his stubborn adherence to his principles and to his having been responsible for wide band FM radio.