[4] In 2015, Person co-founded "Les Jeunes avec Macron" (JAM) with three friends – Sacha Houlié, Florian Humez and Jean Gaborit –[5] which had more than 22,000 members by September 2017.

[6] In March 2016, he helped launch “La Gauche Libre” (“The Free Left”), a think-tank advocating “left-wing liberalism” as represented by Emmanuel Macron.

[12] In November 2018, following the resignation of Christophe Castaner from the position as chairman of LREM, Person briefly considered a candidacy to succeed him but later withdrew from the race for the party leadership;[13] instead, Stanislas Guerini was elected.

[16] In May 2018, Person co-sponsored an initiative in favour of a bioethics law extending to homosexual and single women free access to fertility treatments, such as in vitro fertilisation (IVF), under France's national health insurance; it was one of the campaign promises of President Emmanuel Macron and marked the first major social reform of his five-year term.

[19][20] In 2022, Politico Europe reported that Person had been in talks with potential partners and investors to create a European stablecoin with Carrefour-owned fintech company Market Pay after having been at the forefront of efforts to draft France's cryptocurrency legislation.