Green was born in London, England and educated at University College School.

He then attended Jesus College, Cambridge, where he graduated with a BA in law in 1986.

[1] He was called to the bar at Lincoln's Inn in 1987 and practised commercial and company law from Fountain Court chambers.

In 2008, he was a member of the monitoring board at HM Prison Wormwood Scrubs.

[4][5][1] On 2 November 2020, Green was appointed a judge of the High Court and assigned to the Chancery Division.