[6] He worked initially as a data analyst in the computing industry and for a polling company before joining the Australian Broadcasting Corporation (ABC) in 1989.

[7][9] In time for the 2013 federal election campaign, Green helped introduce the voter engagement tool Vote Compass to the ABC website.

It enables voters to gauge how their views align with candidates based on parties' statements on issues and also provides Green and other analysts a dataset larger than traditional opinion polls.

[18] This was followed in 2015 by appointment as an adjunct professor in Sydney University's Department of Government and International Relations, recognising Green's work in the study of elections.

[19] In the Australian 2017 Queen's Birthday Honours List, Green was appointed an Officer of the Order of Australia (AO)[20] for distinguished service to the broadcast media as an analyst and commentator for state and federal elections, and to the community as a key interpreter of Australian democracy.Green is an avid cyclist, taking long-distance biking trips mostly in Australia and Europe.