What is the relationship between Brian Hartzer and Westpac in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

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.

Answer: employer