Chetwin began her working life as a journalist, and in 1994 was editor of the
Sunday News, and then from 1998 to 2003, the editor of the
Sunday Star-Times. She was the founding editor of the
Herald on Sunday, from 2003 until 2005. Chetwin was the Chief Executive of the consumer advice service
Consumer New Zealand from 2007 until 2020. During her time at Consumer NZ, Chetwin led work on
country of origin labelling, unfair terms, mandatory standards for sunscreens, and consumer protections related to door sales. In early 2024 it was announced that Chetwin would lead a new lobby group, called Grocery Action Group, aimed at persuading supermarkets to lower grocery prices, after the
Commerce Commission determined the sector has excessive profits. Chetwin is a board member of the
Financial Markets Authority, and
Food Standards Australia New Zealand. Chetwin was Chair of the Government review of drug buying agency
Pharmac, chair of the
InternetNZ Policy Review Advisory Panel, and chaired the independent consumer panel giving advice to
Chorus. == Honours and awards ==