A second inquiry into Stafford Hospital was announced earlier this month
The new chief executive at a troubled hospital in Staffordshire has taken up his position.
Antony Sumara is taking over the role at the Mid Staffordshire NHS Trust which looks after Stafford Hospital.
Tim Baggs from the Royal College of Nursing said it was important the hospital gets a period of stability.
A second independent inquiry is being carried out at the hospital after the Health Care Commission said up to 400 patients there had died "needlessly".
His appointment comes as Stafford Borough Council called for a public inquiry into the deaths.
In March, the commission said about 400 more people died at Stafford Hospital between 2005 and 2008 than would be expected.
The Care Quality Commission, the successor to the Healthcare Commission, recently said there had been progress but some areas were still underperforming.
Mr Baggs said Mr Sumara's appointment should establish a platform of certainty so the hospital could continue to improve.
"It is important the improvements continue and there is no complacency on the issues which still remain to be addressed," he said.
The hospital's former chief executive, Martin Yeates, resigned in March, before a damning report into the hospital was published.