His work shows a critic to the modern society due to the tough censoring he suffered during the dictatorial period in Brazil. He founded the "Grupo Rex" together with Geraldo de Barros and Wesley Duke with one main objective: to analyse in a pejorative way the art in that moment which, according to them, was based on production, valuation and commercialisation. Leirner won the 2nd Jahnnie Walker prize of Fine Arts and represented Brazil at the 48th Venice Biennale, as well as the Biennale de Sao Paulo in several occasions. In 2007, the ABCA (Brazilian Association of Art Critic) awarded him for his artistic career, and in 2009 he was honoured as "Reference Artist" by the Itau Cultural Institute. He also won the price "Gobernador del Estado de Sao Paulo”.