UPDATE – one person guessed correctly via social media message, but since it seems nobody else knows the answer, here it is: Hiram Percy Maxim ! He created the American Radio Relay League (ARRL) in 1914. 

[EARLIER] Quite simply, who is the mystery ham radio operator in the picture and what’s his history?

Unless otherwise known, we’ll give the answer at 19:00z (Friday 19th).

NB: Check out the previous 36 DX Shoebox finds – click image: