A specialist in the collectors departments at Bonhams and Sotheby's in London Mark went on to join an internet company where he became a director, forming and running its ground-breaking alliance with eBay Live Auctions.

He is now the resident 20th century design and collectables specialist for Miller's, co-author of Miller's Collectables Price Guides, and also writes regular columns for Collect It! and BBC Homes & Antiques magazine.

Mark is also an expert on the BBC Antiques Roadshow, has appeared on the BBC 20th Century Roadshow, lectured at prestigious locations (including the Victoria & Albert Museum in London and the Royal Ontario Museum in Toronto), and has also contributed to newspapers and radio and TV programmes around the world.

He is a member of the Decorative Arts Society, and is Vice-Chairman and a Trustee of the charitable Glass Association, the largest national vintage glass collectors' society in the UK.

Co-Presenter of Cracking Antiques for BBC2 Mark is an antiques and collectables expert on the Antiques Roadshow and a passionate collector of 18th century etchings and 20th Century ceramics.