Until last week, Grieve was shadow attorney general. A talented Commons performer with a cerebral air, visitors to the ConservativeHome website voted him the politician they would most like to see promoted to the shadow cabinet.
What is his background?
Grieve was a pupil at Westminster School in London before going on to study modern history at Magdalen, Oxford, after which he trained as a barrister. In 1997 he clinched the Tory nomination for Beaconsfield, one of the party's safest seats.
Where does he sit politically?
Grieve is a one-nation Tory with a track record of championing civil liberties that has often found him at odds with the party leadership. He has also worried the right of the party by calling the 7/7 London bombings 'totally explicable'.
Why he is a man to watch
In the short term, Grieve will be focused on taking Gordon Brown to task over 42-day detention. In the long term, he will have to have to come up with policies that tap in to voters' anger about rising crime rates.
Things you might not know
Four years ago Grieve made a citizen's arrest on a vandal who was destroying a bus stop.