[1] He is best known as the creator of the Netflix series Lupin and Criminal, the Apple TV+ thriller Hijack, and ITV's The Long Shadow.
He has also worked on the shows Litvinenko, Stag, My Mad Fat Diary, The Hour, The Tunnel, and the first season of Killing Eve.
[2][3] Whilst a teenage student at Wellington College, Berkshire, Kay met director Jim Field Smith, with whom he often collaborates.
[5] Kay became a full-time writer in 2009, after he won the Brit List with his feature script Good Luck Anthony Belcher.
[7] Litvinenko's widow, Marina, and the Metropolitan Police supported the production of the series.