Utilize the input text as a context reference, choose the right relationship between Brian Hartzer and Westpac from the options. Options: 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.

There have been some excellent recent examples of this including the following appointments: Brian Hartzer at Westpac Banking Corp, Jon Sutton at Bank of Queensland, Ryan Stokes at Seven Group Holdings, Peter Tonagh at News Corp Australia and Chris Smith at CSL.

Answer: employer