Utilize the input text as a context reference, choose the right relationship between Natalie Walker and University of Auckland 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.

Our congratulations to Dr. Natalie Walker of the University of Auckland for conducting this landmark trial.

Answer: employer