Michael Stiassny has today announced his resignation as chair of the New Zealand Transport Agency (NZTA) board, just over a year into a three-year term.
Mr Stiassny said he has completed what he set out to do which was to reposition the agency to focus on public safety.
Mr Stiassny was appointed for a term of three years commencing on 19 April 2018.
Transport Minister Phil Twyford acknowledged and thanked for Mr Stiassny for "exceptional service".
"Michael has worked tirelessly to not only uncover, but to resolve issues, particularly in relation to systemic failure within the Transport Agency.
"As a result of his leadership over the past year, New Zealanders can have confidence that the Transport Agency is fully focused on ensuring public safety on our roads," Mr Twyford said in a statement.
Mr Stiassny has a background in several public and private directorships and is the current chair of Ngāti Whātua Ōrākei Whai Rawa Limited and Tower Limited.
He was also the chair of Auckland lines company Vector until he stood down in November last year.