The public inquiry into the Grenfell Tower disaster is to be led by retired Court of Appeal judge Sir Martin Moore-Bick, sources confirmed.
Theresa May has insisted that residents will be given a say over what direction the investigation takes.
The prime minister said that a full inquiry led by a judge needed to take place to make sure what happened at the tower block is "properly investigated".
Moore-Bick's appointment is expected to be officially announced this morning (June 29). He specialised in commercial law and had a legal career spanning nearly 50 years.
Cladding at tower blocks across the country has already had fire safety tests following the Grenfell Tower fire and 120 samples were found to be combustible.
However, the National Housing Federation has called on the government to stop the testing and instead focus on making people safe.
David Orr, the chief executive, said: "Across the country, valuable resources, from specialist equipment to expert time, are being poured into a testing process of which the results are already known."
The Metropolitan Police has said it will be months before the final roll call of victims of the Grenfell Tower fire is established.
Westminster Coroner's Court has already opened and adjourned inquests into seven Grenfell Tower victims, including baby Leena Belkadi and her eight-year-old sister, Malak.
A vast criminal investigation into the fire also continues. Sixty organisations have been identified as having a hand in the tower's refurbishment, which is suspected to have helped the blaze spread.