Young Entrepreneurs' Challenge - About the judges

Stephen Grabiner, experienced private investor

Stephen Grabiner is the former head of Global Media at Apax Partners. He was also responsible for Apax's investments in Israel. Prior to Apax, Mr Grabiner, was chief executive of ONDigital Plc and managing director of the Telegraph Plc. He also spent time at Express Newspapers in the 1990s.

He was recently appointed to the board of directors at The Times Newspapers - , the first director to have been named since James Murdoch left the company last September.

He is involved as an advisor and supporter to a wide range of community charities. He lives in north London and is married to Miriam and they have three children.

Nick Leslau, chairman of the Prestbury Group of companies

One of the UK's most well-known property players, Nick Leslau is a chartered surveyor who has been been chairman and chief executive of Prestbury group of companies, which runs over £3 billion of assets, since it commenced business in January 1998. He was previously chief executive of Burford Holdings plc for 13 years until his resignation in 1997 having created a £1 billion company and delivered 1,300 per cent Net Asset Value per share growth over a ten year period as a quoted company. He sits on several company and charity boards and is a director and co-owner of Saracens Rugby Club and a director of Max Property Group Plc. He has appeared on Channel 4's The Secret Millionaire and BBC's High Street Dreams with Jo Malone.

Philip Lewis, head of the Kirsh Group property division

Philip Lewis is a Chartered Surveyor who has had experience of most aspects of the property market since starting work in 1972.He heads the property division of the Kirsh Group which is part of Natie Kirsh's international trading business and he is a non-executive board member of the London Legacy Development Corporation,chaired by the London Mayor Boris Johnson, which is responsible for the development of the Olympic Park in Stratford.

Working with Sir John Ritblat for most of his career ,he led the transformation of the original Conrad Ritblat surveying business into a quoted property investment company, Milner Estates plc. Subsequently, he was executive chairman of Safestore Plc, president of the British Council of Shopping centres and also chairman of Sport England,London.He is involved in a number of charities; a founding trustee of the London Maccabi Recreational Trust and has a regular involvement with Jewish Care. He has a strong interest in sport having won a gold medal at the 2009 Maccabiah, completed two London Marathons and also the challenging Cresta Run in St Moritz.

Claude Littner, corporate turnaround specialist

Lord Sugar's close business associate, Claude Littner is perhaps best known for his appearances on The Apprentice as the tough interviewer.

The chairman of IT company Viglen, his working life spans over 40 years. He has been actively involved in a wide range of businesses and industries.

He is the former chief executive of Amstrad and Tottenham Hotspur, and former executive chairman of five-a-side football company Powerleague. He has gained a reputation as a corporate turnaround specialist, parachuted into distressed companies with the objective of restoring financial stability, setting the strategy and re-establishing a management team.

In July he starred in Channel 4's World Maddest Job Interview.

Robert Voss, managing director of Voss International

Robert Voss is a leading authority on metal. After graduating in management science from Manchester University, Mr Voss joined Brookside Metal as a graduate trainee in 1975 and became a Director of Metramet in 1980 before starting Voss International Ltd in 1987, where he is chairman and chief executive. He holds several other chairman and consultancy positions including at Metal Exchange Corp, The International Trade Council and the International Arbitration Council for Metals.

He is the only person to have been elected president of Eurometrec twice - from 1994-98 and again 2008 onwards. He has lectured around the world, recently in Las Vegas with George W Bush and was a judge on the National Business of the Year Award. An active investor, he is a venture partner at Octopus Investment where he has a stake in seven companies. He is an adviser to a number of other companies. Married with three children and two grandchildren he enjoys golf, cycling, football, sport, travel, family and young businesses.