Marcus is a Director and Head of Roseberys Picture department. He oversees both Old Masters, 18th & 19th Century Art and Modern & Contemporary Art auctions.  Before joining Roseberys in 1998 Marcus studied Fine Art at the Slade School of Art, and co-founded an independent dealership selling 20th century glass and ceramics in Kensington Church Street, London.

Marcus has been the driving force behind the continued development and growth of the picture department at Roseberys, growing the department to hold ten specialist auctions a year.

Marcus has a personal interest in antique frames, portrait miniatures and 19th century paintings. His career highlights include the attribution and successful sale of the rare work by Leon Bakst depicting the artist and founder of the Ballet Russes Serge Diaghilev bathing at the Lido in Venice, which sold for £540,000. Alongside this the small oil on board by John Constable of the back of a terrace house that achieved a sale price of £375,000. Both of which he has found a pleasure to be an instrumental part in the sales of.