Currently Chief Executive of Local Partnerships, Bailey was previously Director of Public Services at HM Treasury and Chief Executive of the London Borough of Islington.
City Hall says she will be responsible for “the operational management of MOPAC and for delivering its priorities”.
Her appointment was announced by Stephen Greenhalgh, Deputy Mayor for Policing and Crime.
Former chief executive Catherine Crawford and deputy Jane Harwood left the organisation in July without a handover period or successors being appointed.
Following their departures Mayor Boris Johnson asked London Assembly Members to agree to the appointment of Jeff Jacobs, City Hall’s head of paid service, as interim Chief Executive.
However AMs from opposition parties objected to the appointment, saying Jacobs did not have the experience or time necessary to carry out the role.
The Mayor was subsequently forced to second a Home Office civil servant to fill the leadership “vacuum” within the MOPAC.
City Hall has also announced the appointments of four Non-Executive Advisers to advise Mr Greenhalgh “on a range of important work areas”. The four are:
Adviser for Neighbourhoods: Steve O’Connell, Croydon councillor and London Assembly Member for Croydon & Sutton
Adviser for Property & Estates: Jonathan Glanz, Director and Chairman of property company ‘45West’ and cabinet member for housing and property, Westminster Council
Adviser for Procurement: Jeremy Mayhew, strategy consultant and City of London councillor, formerly board member of the London Development Agency and Strategic Rail Authority
Adviser for Organisational Change: Faith Boardman, former Chief Executive of Lambeth Council, and Civil Service Director-General at Department for Work and Pension and before that Chief Executive of the Child Support Agency; and former Independent member of the Metropolitan Police Authority.
Announcing the appointments, Mr Greenhalgh said: “Helen’s outstanding track record in the leadership of public services in London and at a national level will play a critical role, and I am confident that alongside a new team of advisers we will ensure that MOPAC delivers on the Mayor’s manifesto and shows the leadership needed to make London safer.”