Peter McGauran will not renew his contract as chief executive of Racing Australia and will take up a yet-to-be disclosed corporate role.
McGauran tendered his resignation to the Racing Australia board on Thursday and will leave the position when his contract expires in December.
Chairman John Messara said the board accepted his resignation with regret and would consider a replacement process when they met again in September.
G3 - The Coral.co.uk Winter Derby (class 1)
G2 - The Sky Bet Dovecote Novices' Hurdle Race (class 1)
G2 - The Betbright Pendil Novices' Steeple Chase (class 1)
G2 - The Betbright Adonis Juvenile Hurdle Race (class 1)
G3 - The Betbright Steeple Chase (handicap) (class 1)