Hasler was born in Dublin on 27 February 1914, the youngest son of Lieutenant Arthur Thomas Hasler (a Royal Army Medical Corps quartermaster), and his wife, Annie Georgina (née Andrews).
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In 1940, Hasler served as fleet landing officer in Scapa Flow, and was then sent to Narvik in support of the French Foreign Legion in the Norwegian campaign, for which duties he was appointed an Officer of the Order of the British Empire (OBE), mentioned in despatches, and awarded the Croix de guerre.
The most widespread form of self-steering, the servo pendulum, was introduced to cope with the power required to operate a larger rudder and was a successor to the servo trim tab principle (introduced by Herbert "Blondie" Hasler).
Herbert Hoover | Herbert Kitchener, 1st Earl Kitchener | Herbert von Karajan | Frank Herbert | Herbert Marcuse | Herbert Read | Herbert Blomstedt | Herbert Grönemeyer | Herbert Beerbohm Tree | Matthew Herbert | Herbert Spencer | Des Hasler | Victor Herbert | Herbert | Herbert A. Simon | George Herbert | Charles Herbert Best | Herbert Howells | George Herbert, 5th Earl of Carnarvon | Brian Herbert | Aubrey Herbert | Sidney Herbert, 1st Baron Herbert of Lea | Herbert Chapman | Herbert Baumann | Herbert Austin | George Herbert Mead | Herbert Wise | Herbert Gintis | Herbert de Losinga | Henry Herbert, 4th Earl of Carnarvon |