In 1998, Dejardin was appointed as curator at Dulwich Picture Gallery and was responsible for the gallery's permanent collection of paintings, furniture and works on paper, and for delivering the gallery's exhibition programme. He succeeded Desmond Shawe-Taylor as director in 2005.[6] As director, he was responsible for coordinating several major exhibitions a year. He personally co-curated Henry Moore: at Dulwich Picture Gallery in 2004. In 2011, he was lead curator of the first major exhibition in Britain since 1925 dedicated to Canada's most famous artists: Painting Canada: Tom Thomson and the Group of Seven. This was followed in 2014 by another Canadian-themed show, From the Forest to the Sea: Emily Carr and British Columbia, co-curated with Sarah Milroy, with whom he was to further collaborate on Vanessa Bell (2016), and David Milne (2017). In August 2016 the Dulwich Picture Gallery announced that he would be leaving in April 2017 after 19 years at the gallery, 12 of them as director[3] to be director of the McMichael Canadian Art Collection in Canada.
In 2020 he appeared in the television series Landscape Artist of the Year Canada as a commentator on the history of Canadian landscape art.[7]
On 8 September the McMichael Canadian Art Collection announced that he would be retiring on 27 October 2023.[1]
Selected bibliography
Rembrandt to Gainsborough: Masterpieces from Dulwich Picture Gallery. With Desmond Shawe-Taylor and Giles Waterfield. Merrell Holberton Publishers, 1999.
Henry Moore: At the Dulwich Picture Gallery. With Ann Garrould and Anita Feldman Bennet. Scala Publishers, 2004. ISBN978-1-85759-352-5.
The Dutch Italianates: 17th-Century Masterpieces from Dulwich Picture Gallery, London. Philip Wilson Publishers, 2008. ISBN978-0-85667-657-4.