He has been appointed chief executive of Leisure Connection Limited, the UK's largest operator of public sector sports and leisure facilities.
'Barking & Dagenham has been an excellent authority to work with,' said Graham. 'The pace of change and quality of services make it among the best in London and it is showing tremendous potential for the future. Regeneration will see major changes in the borough over the next 10 to 15 years and I wish my colleagues the very best for the challenges ahead.'
During his time at the helm Mr Farrant has led the team in pushing ahead with regeneration and achieving beacon status for the transformation of secondary education in the borough. Barking & Dagenham has also achieved several major awards for its management team, social services and PFI initiatives.
Leader Charles Fairbrass said: 'Graham has built a good management team and raised the profile of the borough and its services both locally and nationally, in co-operation with local councillors.
'Services have shown a significant improvement during the past four years and we wish him well in his future career.'