[5] He is the son of Raúl Celis Cornejo, who was the last Valparaíso Region intendant appointed by Augusto Pinochet's dictatorship.

In 1984, Celis Montt began his career joining the National Union Movement, in which he was vice president of the youth branch.

In that party he has been National Councilor and president of the Viña del Mar-Concón communal section.

In 2001, his party presented him as a candidate for the 14th District (Vina and Concón), but before the election Celis Montt decided to withdraw his candidacy.

In January 2021, he ran as a candidate representing to Vamos por Chile for a seat the Chilean Constitutional Convention.