He was editor of the Newspaper "The Friend of the People" (1789-1792).
After the Flight to Varennes in 1791, Marat claimed that Louis was "unworthy to remount the throne" and denounced the National Convention for not deposing him.
As a delegate to the convention, he advocated reforms such as: income tax, vocational training for workers and shorter terms of military service.
On July 13th he was murdered at the hands of Charlotte Corday in his quarters.
The painting "The Death of Marat" was completed in the succeeding months and his name was given to 21 towns in France.