A former journalist and Downing Street staffer, Green was elected to Parliament in 1997. He was made shadow education secretary in 2001. After a spell away from the front bench under Michael Howard, he was trusted with the tricky immigration portfolio in December 2005.
What's his background?
Born in Barry, Wales, and educated at Reading School and Balliol College, Oxford. Green has worked as business news editor for The Times and Channel 4 News. Between 1992 and 1994, he worked in the PM's Policy Unit under John Major, for whom he had previously served as a speechwriter.
Where does he sit politically?
A moderate on the left of the party. He was described by the New Statesman as 'pro-Europe pro-green and pro-life ... the last of the Tory wets'. Green supported Ken Clarke in the 1997 leadership election and initially backed Michael Portillo in 2001.
Why is he one to watch?
Green has always been highly regarded by those on the centre and left and he is due a promotion. His assured demeanour after last week's arrest story has raised his profile and should count in his favour next time David Cameron reshuffles the shadow cabinet.
Something I may not have known
Green's wife Alicia Collinson, a barrister, has published a book entitled Politics for Partners: How to Live with a Politician.