When financial constraints led him to plan emigration to America, he met by chance M. de Falloux, the French minister responsible for public education, and was appointed professor of foreign languages at the Tours Lycée in around 1849. He thereafter transferred to the Marseilles Lycéest When, in 1869, Ferdinand de Lesseps ran for election as deputy from Marseilles, Blowitz became involved in a scandal due to supplying information to a Legitimist newspaper.
This led to calls for his expulsion from France, which he countered by retiring to the country.
The next year, the calls began again, as he began to predict the collapse of the Empire during the Franco-Prussian War. This time, he evaded them by naturalising as a French subject whilst the Battle of Sedan was being fought.
Once naturalised, Blowitz returned to Marseilles, where he worked for Adolphe Thiers. He later worked gathering information for him at Versailles, and as a result Thiers offered him the French consulship at Riga.
Shortly before he was to accept this, Blowitz became the assistant to Laurence Oliphant, the Paris correspondent of The Times, whilst the second correspondent was absent.
When the second correspondent, Frederick Hardman, succeeded Oliphant, Blowitz remained as assistant, and when Hardman died in 1873 he himself became chief Paris correspondent. In 1875, the duc de Decazes, the Minister of Foreign Affairs, informed him of a confidential despatch from the French ambassador to Berlin, discussing German plans to attack France, and requested Blowitz publish an exposé. He did so, provoking a storm of public opinion, and effectively preventing any chance of the German intention being carried out.
In 1877 and 1888 he successfully exposed internal conspiracies against the Republic.
The same year he was made an Officier of the Légion d"honneur. Blowitz appears as a character in the novella "The Road to Charing Cross" in Flashman and the Tiger (1999) by George MacDonald Fraser.