Carlos Machado was born in Brazil, in 1951. He studied mechanical engineering at UFBA and journalism at Faculdade Cásper Líbero in São Paulo, working as a journalist and poet. In 2002, he created Poesia.net, a biweekly publication dedicated to poetry. He has published several books and anthologies, including Pássaro de vidro (2006) and Tesoura cega (2015). He lives in São Paulo.

Geraldo Valério was born in Brazil, in 1970. He is an illustrator and writer, graduated from the School of Fine Arts at the Federal University of Minas Gerais, with a master's degree in arts from New York University. He began illustrating in 1994 and has works published in Brazil, Canada, the United States, and Portugal. He enjoys working with painting and collage, a technique he finds more intuitive due to its incorporation of accidents. He is the author of Abecedário de aves brasileiras and Abecedário de animais brasileiros. He lives in Canada.