The restructure also sees TenetConnect and TenetSelect managing director Mike O’Brien appointed as group brands director.
Greenwood says: ‘The board extends its thanks to Robin for his time, energy and advice whilst chairman and wishes him well in his endeavours. Mike O’Brien has been with the group for nearly two and a half years and his appointment to the group board is well deserved.”
Former Tenet chief executive Simon Hudson stepped down from the firm in August.
Tenet says it is also set to appoint two new independent non-executive directors.