[4][dead link] Under Ian McNair's leadership the organisation established offices in Melbourne and New Zealand.
In 1973 the McNair Survey merged with their competitor, Anderson, to become the largest market research firm in Australia, with McNair Anderson providing the national radio ratings, TV ratings and national readership survey.
AGB marginalised the original leadership team over time and McNair finally left the organisation in November 1985.
At Quadrant Research Matt Balogh joined in 1998 initially as marketing director and later to become general manager.
The following year Korbel negotiated the sale of Quadrant to The Gallup Organization, resulting in the dismissal of nearly all the staff in 2001.