Stefan Matthews, an IT expert whom Wright had known for ten years, since they both worked for the online gambling site Centrebet. In those days, around 2007, Wright was often hired as a security analyst by such firms, deploying his skills as a computer scientist (and his experience as a hacker) to make life difficult for fraudsters.

https://www.lrb.co.uk/v38/n13/andrew-ohagan/the-satoshi-affair