Take context from the input text and decide on the accurate relationship between 'Brian Hartzer' and 'Westpac' from the options provided.
Options: employer, member of, position held, chief executive officer

Westpac managing director Brian Hartzer told the hearing his bank had removed 11 planners since January 2009 after they offered bad advice that resulted in the bank paying $2.5 million in compensation to customers.
employer