Sébastien is the co-founder and Partner of Montabonel & Partners and ARMP, a strategy agency working with governments, public and private institutions and large collections with offices in London, Berlin and Beijing. He is also the Chair of Trustees for the Foundation Art Institutions of the 21st Century.
The foundation was set up with the objective to support art professionals with their research projects within the cultural field. In 2006, he founded Alaska Editions, a bespoke imprint focusing on artists’ editions and specialist documents including publications such as Dominique Lambert (2010), Lost and Found (2011), Pictures of Hell (2014), Lewis Baltz with works by Carl Andre and Charlotte Posenenske (2016).
Sébastien‘s many years of experience as a European Senior Specialist in Contemporary Photography at Phillips de Pury led him to collaborate with important private collections. In 2011 Sébastien advised Tate Modern in the acquisition of the Jacobson/Hashimoto Collection. In partnership with the Saatchi Gallery, London, he started The Private Collector Project, organised the first public display of the Franks-Suss Collection (2010) and the exhibition of the Juan Yarur Contemporary Art Collection (2010).
His recent projects include Media in the Expanded Field (2015), Going Public: International Art Collectors in Sheffield (2015), the European Summit: How can public art institutions unlock the potential of philanthropy? (2015) and Lewis Baltz with works by Carl Andre and Charlotte Posenenske (2016), Art Institutions of the 21st Century (2016).
He is also a nominator for the Prix Pictet and is part of the curatorial committee of Photo London 2015 and 2017.