Which Dragon's Den investor was known for owning the stationery retailer Ryman?

Theo Paphitis was the Dragon's Den investor known for owning the stationery retailer Ryman.

Paphitis is a British retail entrepreneur whose business interests included Ryman, the high-street stationery chain. He became widely known to television audiences through Dragon's Den, where he assessed entrepreneurs’ proposals alongside other investors and negotiated possible equity deals.

Ryman is often described as a stationery retailer, although the wider business group associated with Paphitis has included other consumer brands and retail interests. That broader portfolio is why descriptions of his career can mention more than one company.

The answer is not Peter Jones, Duncan Bannatyne or Touker Suleyman: those are also Dragon's Den investors, but they are associated with different business histories. Paphitis’s connection with Ryman is the distinguishing clue in this question.