"After spending most of the past 22 years abroad, Scott is delighted to be returning to this demanding and challenging role in Wellington.
"He shares the board's vision of restoring public trust and confidence in ACC through transforming the business model to improve the quality of service delivery to clients."
Pickering will take over on May 1 from acting chief executive David May, who has been in the role since Stewart's departure in December.
A former student at Aotea College in Porirua, Pickering has been with Willis International - a leading global insurance broker with about 17,000 employees and offices in nearly 120 countries - since 2010.
He was previously the Asia and Middle East regional chief executive of RSA Insurance Group, and an executive with ACE Insurance - formerly Cigna - including as managing director of ACE Insurance Ltd NZ.
Pickering is married with four children.
His predecessor at ACC received a performance bonus of $100,493 for the 12-month period ending December 31 when he left the corporation.