His work, prior to Parliament, included photographic technician, barman, engineering contractor, truck driver and sales representative.
[2] He moved to Otago in 1994 and took up wine making,[2][6] and obtained a Certificate in Grapegrowing and Winemaking from Eastern Institute of Technology in 2001.
[8] Prosser also ran in the 2007 Central Otago District local elections, both for mayor and for councillor for the Earnscleugh-Manuherikia Ward.
[14][15] His roles in Parliament included membership of the select committees for Law and Order, Primary Production, and Social Services.
[22] In May 2020, Prosser claimed on his website that the COVID-19 pandemic was a global conspiracy intended to transfer greater power to financial and political elites.
[23][non-primary source needed] Prosser wrote the 'Eyes Right' column in the Investigate magazine for ten years.
[25] Prosser released the book Uncommon Dissent in January 2012 outlining his political opinions, in which he refers to himself as a "Kiwi Nationalist".
[29] Prosser further stated that the rights of New Zealanders' were being "denigrated by a sorry pack of misogynist troglodytes from Wogistan, threatening our way of life and security of travel in the name of their stone age religion, its barbaric attitudes towards women, democracy, and individual choice".
[30] It subsequently emerged that Prosser's column was written after a pocket-knife he was carrying had been confiscated by airport security.
[34][35] In March 2013 the United Nations' Committee on the Elimination of Racial Discrimination said it "regrets" Prosser's remarks, and "welcomes the strong criticism of such statements by the Minister of Justice and Ethnic Affairs and the Race Relations Commissioner, among others".