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.

Louie Douvis Share on twitter by Michael Smith Westpac Banking Corp boss Brian Hartzer has set some ambitious shareholder return targets and outlined a program to invest heavily in digital technology and cut the size of bank branches while picking up an additional 1 million customers along the way.

Answer: employer