Mark Weiss is a leading authority on 16th and 17th century Northern European portraiture, with over forty-five years experience in the field. He started his art dealing career in 1972, working in his parents' gallery in Colchester, Essex. Following the death of his father, in 1986 he opened his first gallery in Albemarle Street, Mayfair dedicated to 16th and 17th century North European portraiture. In 2003 he acquired prestigious premises in 59 Jermyn Street, St James's, which is now one on the last grand Old Master gallery spaces in London. As a long standing exhibitor at TEFAF in Maastricht, he has a well-established reputation for his scholarship and eye for discoveries, and has made sales to many important institutions around the world including the Cleveland Museum of Art, the Huntington Art Gallery, the Yale Centre for British Art, the Art Gallery of South Australia, the National Gallery of Victoria, the National Gallery of Hungary, Tate Britain and the National Portrait Galleries of London and Edinburgh, as well as to the Dutch and Danish Royal families. He has also organised exhibitions and published scholarly catalogues dedicated to Tudor and Jacobean portraiture as well as the artists Frans Pourbus the Younger and Cornelius Johnson.
Mark is a life patron of the National Portrait Gallery, London and Benefactor of the Rubenianum, Antwerp and CODART.