Patrick is a board member of the Prisoners' Education Trust (PET), the Dartington Service Design Lab, and the Campaign for Social Science.
Following a brief stint at Finsbury Financial Communications and the Institute for Public Policy Research, Diamond was appointed as Director of the Labour Party organization and magazine Progress.
In late 2000, he was made Special Adviser to the then Secretary of State for Northern Ireland, Rt Hon Peter Mandelson MP.
From June 2001-September 2004, Diamond was a member of the Number 10 Policy Unit with particular responsibility for the government's public service reform agenda.
[1] After the Labour Party's victory in the 2005 General Election, Diamond was appointed as Director of the think tank Policy Network and took on a number of academic positions.