[1] Ketter was born in Brisbane and grew up in the suburb of Holland Park.
Ketter worked for the Shop, Distributive and Allied Employees Association (SDA) from 1982 until his election to the Senate in 2014, initially as a research officer and ultimately as Queensland Branch Secretary from 1996.
[3] In this capacity, Ketter led Senate Inquiries into high profile issues such as Corporate Tax Avoidance, the Cooperatives and Mutuals sector, the Dairy Industry, and Non-conforming Building products, including asbestos and flammable cladding.
In 2018, he Chaired an inquiry into the indicators of, and impact of, regional inequality in Australia.
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