- Ten-second biography
Byrne was elected as MP for Birmingham Hodge Hill in July 2004, aged just 34. Within nine months, Tony Blair made him junior health minister and in 2006 Byrne was made immigration minister. Now in the Cabinet Office, his job is to co-ordinate policy across departments.
- What is his background?
Born in Warrington, Byrne was comprehensive school educated and worked part-time at McDonald's. He went on to study at Manchester University and Harvard Business School before working for multinational consulting firm Accenture and merchant bankers NM Rothschild. Later, he co-founded the venture capital-backed e-commerce company EGS Group.
- Where does he sit politically?
The managerial Byrne is seen as one of the next generation's Blairite voices. Former home secretary John Reid is said to be a big fan after Byrne's careful handling of the controversial ID card issue.
- Why he is one to watch
Despite his Blairite credentials, he also gets along with the Brownites. Children's secretary Ed Balls is said to have turned to Byrne for advice on his conference speech. In his new job, he will attend cabinet meetings and liaise between Labour's warring factions.
- Tell me something I might not know
Byrne's best time for a half-marathon is one hour 58 minutes.