Harry MacElhone owner of Harry's Bar in Paris.
“The Bloody Mary was created by Fernand "Pete" Petiot, a bartender at Harry's NY Bar Paris, and he was brought to NYC shortly after repeal of prohibition to work at the King Cole Bar in the St Regis Hotel. The name of the drink was changed to the Red Snapper for a while, but eventually it was again known as the Bloody Mary.”
(source: Gary Regan, Ardent Spirits)
The Blue Lagoon was invented by Harry’s son Andy, in 1972.