During the period 1978-82, he worked for as a statistician of ‘Australian Rules Football’ and cricket reporter for a leading newspaper.
Later, when he was in the final year of school, he went out in search of jobs and managed to get a job for the weekends at ‘Channel 10’, while he simultaneously continued his studies. Eventually, he got a full-time job at the network.
In 1993, he got a major breakthrough when he was made the host of a sports program at the ‘Nine Network’. The following year, he became the presenter of ‘The Footy Show’ of the ‘Nine Network’. He continued to host this show for the next decade.
In 1998, he was chosen as the Victorian representative to the ‘Constitutional Convention’ which was followed by the ‘Australian Republic Referendum’ held for the amendment of the Australian Constitution.
On 29th October, 1998, this sports journalist was chosen as the President of the ‘Collingwood Football Club’ which was a football club of the ‘Australian Rules Football’.
In 1999, this consummate presenter became the host of the show ‘Who Wants to Be a Millionaire?’, which was an Australian game show. He even anchored the ‘Sydney New Year’s Eve 1999-00’ which ushered in a new millennium.
In 2003, this brilliant television presented hosted the ‘Logie Awards’ which is the annual Australian television industry awards, in 2003 and the following year.
In 2005, he was the co-presenter of the ‘Logie Awards’ along with Andrew O’Keefe and Rove McManus. The same year, he simultaneously hosted three shows on ‘Television Network’s’ Seven, Nine and Ten channels in order to raise funds for the victims of the ‘2004 Asian Tsunami’.
On 9th February, 2006, it was declared that McGuire would become the next CEO of the ‘Nine Network’ as he would succeed the former CEO of the network David Gyngell. To take up this responsibility, he had to forgo his shows ‘The AFL Footy Show’ and ‘Who Wants to Be a Millionaire?’
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In 2006, he went to Beaconsfield, Tasmania and gathered the journalists of the ‘Nine News’ who were reporting the ‘Beaconsfield Mine Collapse’ which occurred there and himself hosted the event which was featured at ‘The AFL Footy Show’.
He resigned from his office of the CEO of the ‘Nine Network’ in the year 2007 and re-launched his on-screen career. The same year, he presented the quiz show ‘1 vs. 100’. He also hosted the show ‘A Current Affair’ for a brief period of time the same year.
The tragic ‘Black Saturday Bushfires’ (Victorian Bushfires) which occurred in February 2009, claimed many lives and is regarded as the worst bushfires to have occurred in Australia. A telethon regarding this tragic incident was done which was hosted by this famous television personality.
The same year, he began presenting the Australian television quiz show ‘Millionaire Hot Seat’ which is still on-air.
In 2011, he was the host of the telethon which was broadcast to help the ‘2010-2011 Queensland flood’ victims. He was accompanied by Karl Stefanovic and Leila McKinnon, in the program as co-hosts. The same year, he hosted three short-lived shows ‘The Million Dollar Drop’, ‘Between the Lines’ and ‘This is Your Life’.
He collaborated with the ‘Fox Footy’ in 2012, and began commentating for the ‘AFL’ and also continued hosting the ‘Millionaire Hot Seat’. The same year, he was a presenter at the ‘Triple M’ radio program during the ‘2012 London Olympics’. He also hosted the opening and closing ceremony of the event along with journalist Leila McKinnon.
He is the director of the ‘Victorian Major Events Company’, which is a foundation for sporting and cultural events based in Melbourne, Victoria, Australia.