As a student in the 1960s, he was initially attracted to the Communist Party of New Zealand which tried to groom him to be the party's lawyer. The CPNZ had been the first communist party in the world to side with China in the Sino-Soviet split. However, Jesson struck out on his own, writing a number of polemics such as Traitors to Class and Country: A Study of the Conservative Left and publishing a journal called Te Tao. As a student he was involved in anti-Royalist activities, being associated with the burning of a New Zealand flag by another student during a visit by the Queen Mother. He founded the Committee to Oppose Royal Tours.
Republicanism
Jesson was a republican who championed an independent political and intellectual culture in New Zealand. He rebelled against the habit of the New Zealand Left to take its political cues from overseas countries. He founded the anti-royal Republican Association in 1966, later moving to Auckland and forming a political party to push the republic issue in 1967. Around 1970 he also associated briefly with Trotskyist activists such as Owen Gager and David Bedggood, and he contributed occasionally to journals such as Dispute, New Zealand Monthly Review and Spartacist Spasmodical. When activity in the fledgling Republican Party petered out, Jesson wound up the party in 1974, but continued to publish a widely read pro-republican broadsheet entitled The Republican, covering both republican and leftwing issues in a plain and unpretentious style. This journal also featured articles by many other New Zealand leftists.. Jesson was a founding member of the Republican Movement of Aotearoa New Zealand, until his death in 1999. By this time, Jesson – who never had much of a steady career, working variously as labourer, wool presser, baker, dustman and freezing worker – was living with his wife Joce, an educationist and tutor/lecturer, and worked as a househusband as well as pursuing his writing. He was interested in developing an indigenous Marxian tradition in New Zealand, and participated in the four NZ Marxian Political Economy conferences staged in the 1970s and early 1980s.
It was only late in his life that Jesson became better known to the general public, as a political columnist for Auckland's Metro magazine and contributor to other magazines such as North & South and New Zealand Political Review. He also published four books about the neo-liberal revolution in New Zealand, and became a fellow of the Auckland UniversityPolitical Science Department.
Entering politics
In 1990, Jesson joined Jim Anderton's Labour party splinter NewLabour Party. He stood as a candidate for the party in the Panmure electorate in. He again stood in Panmure in, for the Alliance. In 1991, he was elected to the Auckland Regional Council as an Alliance candidate, becoming chair of the Auckland Regional Services Trust between 1992 and 1995.
Death
Jesson died of cancer in the Auckland suburb of Mangere Bridge on 30 April 1999.