The one on the Apprentice was featured at the very beginning of the show when Tom ran up the stairs to call the other contestants to gather downstairs as Lord Sugar was waiting (clue: on the first floor landing)
The chair is the Fit Office Chair made by Interstuhl. In 2009, the chair won an award for design innovation at the Neocon Office Furniture Exhibition in Chicago. It is made out of mesh material and fits around your body when you sit in it. Very ergonomic.
My picture was taken at their Showroom during the Clerkenwell Design Week 2011 in London.
}My take on the Fit Office Chair - One size fits all comfortably!!!!~