He was the son of Luis Mendoza Almenara and Dolores María Claudia Fermina Habersperger Fort.
He entered the Diplomatic Service by competition, working in Lima and in commissions in France and Argentina.
While on his way to Buenos Aires, on his return to his diplomatic work, he learned of the coup d'état of July 18, 1962 against President Manuel Prado Ugarteche, for which, as soon as he stepped on Argentine soil, he resigned his duties as Vice Consul and Third Secretary at the embassy.
Mendoza Habersperger was alderman of the Municipality of Metropolitan Lima, where he served as inspector of popular and youth recreation programs and social assistance to the underprivileged old age (1963).
During the first government of the architect Fernando Belaúnde Terry, he was restored to the Diplomatic Service and promoted to Second Secretary.