Annie he was Tony Blair's Head of communication. To sum up what he did
Alastair Campbell possesses unprecedented powers for an unelected party political adviser. Campbell is Director of Communications and Strategy, and as such he controls the Government Information and Communication Service (GICS) in Whitehall, three 10 Downing Street departments (the press office; the strategic communications unit; and the research and information unit); and since February 2002, even the Central Office of Information. The Central Office of Information is of course the Whitehall agency that handles the marketing, press and television advertising campaigns for government departments; its head now acts as chief adviser on all the government's marketing communications, reporting directly to Campbell.
Campbell's contract gives him the power to direct government communications and to present the government's affairs "in a political context". He may give orders to civil servants. He attends cabinet meetings and directly advises the Prime Minister. Formally, Alastair Campbell is simply an unelected special adviser. Yet he has become the government's unacknowledged Minister of Information. His aggressively partisan conduct, manipulation of the media and special deals with selected newspapers and journalists go virtually unchecked either by his political master, the head of the civil service or Parliament. And so a party political special adviser, accountable only to the Prime Minister, has the power to re-shape and direct the traditionally impartial Government Information and Communication Service and all government marketing and advertising activities.
But he wasn't a spokesperson?
Of course he was and he suffered from depression.
The connection is he is now writing about it and making money although at the time he probably caused more damage to other people than anyone else.
He published his diaries (4 volumes) and called them his pension plan, obviously he now needs a pension top up.