[1] Gilles Lebreton earned a doctorate in public law in 1987 from the University of Paris II.

[citation needed] That same group of academics elected Lebreton twice as the president of the law section from 2013 to 2017.

Lebreton said that he was "disappointed by Chevènement during the 2002 campaign, who abandoned his Gaullist positioning and leftist rhetoric.

Lebreton was a member of Marine Le Pen's strategic council for the 2017 French presidential campaign.

Then, in autumn 2017, he coordinated small committee that drafted a "simplified treaty" with the aim of building an "alternative to the European Union", evoking a "median path" "between the choice of an unchanged EU and isolated inward-looking nations”.

Gilles Lebreton is the author of a report on the use of artificial intelligence in the military and sovereign domains which was adopted by the European Parliament on 20 January 2021 by 364 votes to 274.

[8] In Public Liberties and Human Rights (2008 edition), Gilles Lebreton says he regrets that some leaders of the National Front quote Carl Schmitt, denouncing the "danger to public freedoms" that the author's thought constitutes and that he calls it a “philosophy of exclusion”.

In a 2014 interview, however, he mentions that believes that the National Front "has evolved considerably in recent years" and that it had abandoned the referencing of Schmitt.