Although he was educated as an artist, his doctoral dissertation on dialogical practices, entitled Dialogical Practices in Art & Language, 2006, led him to work simultaneously in academia and in the field of cultural policies. This impelled him to take responsibilities at several art institutions, since 2009 when he was appointed Director of La Virreina Centre de la Imatge in Barcelona. Photography and documentary have been two of the most prominent preoccupations in his career. Most of his projects have dealt with postmedia documentary practices as markers of a new political condition in the public sphere.
Some relevant institutional positions include Executive Director at Fundació Antoni Tàpies (2015-2020), Chief Curator at MACBA Museu d’Art Contemporani Barcelona (2011-2013) and Director of La Virreina Centre de la Imatge (2009-2011). In 2003 he was appointed Director of the 12th edition of Primavera Fotogràfica de Catalunya (2004).
His most recent projects include Harun Farocki and Hito Steyerl: Life Captured Still (Galerie Thaddeus Ropac, London, 2020, co-curated with Antje Ehmann); Ariella Aïsha Azoulay: Errata (FAT, 2019); Hannah Collins: I will make up a song... (FAT, 2019); Albert Serra. Roi Soleil (FAT, 2019); Antoni Tàpies: Political Biography (FAT, 2018); Allora & Calzadilla (FAT, 2018); Susan Meiselas: Mediations (FAT, Jeu de Paume and SFMOMA, 2018-2019, co-curated with Pia Viewing); Allan Sekula: Collective Sisyphus (FAT, 2017, co-curated with Hilde Van Gelder and Anja Isabel Schneider); Oriol Vilanova: Sunday (FAT, 2017) and Harun Farocki: Empathy (IVAM and FAT, 2016, co-curated with Antje Ehmann).
Other exhibitions, besides the ones listed above, assess his focus on documentary and photography: Xavier Ribas: Nitrate (MACBA, 2013); Ahlam Shibli: Phantom Home (MACBA, Jeu de Paume and Serralves, 2013, co-curated with Marta Gili and Joao Fernandes); Alexander Sokurov: Military Series (MACBA, 2012); Tangerine Tales (La Virreina Centre de la Imatge, 2011, co-curated with Yto Barrada); Bruno Serralongue: Feux divers (Wiels, Jeu de Paume and La Virreina Centre de la Imatge, 2010, co-curated with Marta Gili and Dirk Snauwaert); 1979: A monument to radical instants (La Virreina Centre de la Imatge, 2011); Antiphotojournalism (La Virreina Centre de la Imatge and FOAM, 2010, co-curated with Thomas Keenan); Ursula Biemann and Angela Melitopoulos: B Zone (FAT, 2007, co-curated with Nuria Enguita); Joaquim Jordà: Cinéma de situation (MACBA, FID Marseille, 2006) and After the News: Postmedia Documentary Practices (CCCB, 2003).
Guerra is Associate Professor at Universitat Pompeu Fabra, Department of Audiovisual Communication, since 2005. Between 2007 and 2009 he taught at the Center for Curatorial Studies Bard College, Annandale-on-Hudson, NY.