Schools standards minister Stephen Timms said the Department for Education & Skills and the council both chose Mr Tomlinson to head the Hackney Education Trust.
He will take up the post when he retires as Ofsted chief in April (LGC, 11 January).
Hackney's education department was sharply criticised by Ofsted in three successive reports.
Mr Tomlinson will take up his post on
1 August when the trust takes over. But he will be involved in key decisions leading up to its establishment.
Alan Wood, chief executive of Hackney Education Trust, welcomed the appointment.
'I believe it to be a clear and unequivocal sign of commitment from the DfES and the council to support our joint programme of improvement,' he said.