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.

Brian Hartzer, Westpac chief executive Westpac chief executive Brian Hartzer said in a memo sent to the bank's staff on Friday that Disney is "one of the world's most loved brands and their Next Generation Experience program has set a new benchmark for how great service can be delivered in a digitally-enabled world".

Answer: employer