Who created the reality television format that became 'Big Brother'?

John de Mol created the reality television format that became Big Brother.

De Mol developed the concept in the Netherlands with a production team at Endemol. The format placed a group of strangers in a specially designed house, isolated them from the outside world, and recorded their interactions through cameras and microphones. Contestants faced nominations and public or housemate votes while competing for a prize.

The first Dutch series premiered in 1999 and was named after the all-seeing authority in George Orwell’s novel Nineteen Eighty-Four. The reality program’s title refers to surveillance and observation, although the television format uses fictionalized entertainment rules rather than reproducing Orwell’s story.

Big Brother was adapted in many countries, including the United States, the United Kingdom, Australia, and India. Its international success helped establish the global reality-TV format market. Endemol later became part of larger media companies, but de Mol is credited as the format’s creator.