Gregório Leozírio Ben Lâmed da Paixão Neto was born in Aracaju, Brazil, on 3 November 1964.

He attended the Benedictine monastery in Rio de Janeiro, Brazil.

In 1986 he gave his religious vows as the Benedictine monk, and in March 1993 he was ordained priest.

On 7 June 2006 he was appointed titular bishop of Fico and auxiliary of São Salvador da Bahia by Pope Benedict XVI, and received episcopal ordination on 29 July 2006.

On 11 October 2023, Pope Francis named him as metropolitan archbishop of Fortaleza.