A 1991 graduate of the École nationale d'administration, Lottiaux was a civil servant and the director general of public services in the municipality of Levallois-Perret from 2001 to 2011 under the mayorship of Patrick Balkany.
[1] He was elected a municipal councillor after his list came first in the first round, holding his seat until 2017.
Later in 2014 he also became newly-elected Fréjus Mayor David Rachline's chief of staff.
He won with 53.6% of the second-round vote, defeating one-term incumbent Sereine Mauborgne of La République En Marche!, as well as challenger Éric Zemmour of Reconquête in the first round.
[3] Lottiaux is an amateur stand-up comedian under the stage name Philippe Bacart.