Clive Gratton - is a video game programmer. Clive Gratton began his career in 2014 and has worked for companies such as D3PA, D3 Publisher, D3Publisher, Creative Assembly, Feral Interactive and SEGA. Clive Gratton's first game was Alien: Isolation which was released 9 years ago. Best Game Clive Gratton contributed to was Alien: Blackout. Clive Gratton's latest work is Alien: Blackout which was released 5 years ago.