The Donegal man working as Director of Australia's Equality Campaign has expressed his delight at the country's overwhelming vote for same-sex marriage.
At around 11.20pm Irish time, Australia's chief statistician revealed that 61.6 percent of voters surveyed favoured marriage equality, with 38.4 percent against.
The result ties closely to Ireland's 2015 vote for marriage equality, where 62.07 percent voted for and 37.93 per cent voted against.
Australia will become the 26th nation to formalise the unions if the legislation is passed by parliament, which is expected despite some vocal opposition within the government's conservative right wing.
Irishman Tiernan Brady, who has been working on the campaign since April 2016 is delighted with the result, but says it doesn't come as too much of a shock.
"The more I travelled, the more I realised the values of Australia are aligned with the values of Irish. It's no surprise at all that the results almost match that of Ireland's vote," he told Independent.ie.
"It's been the most incredible journey. The Australian people are utterly phenomenal. It's like Ireland with hot weather.
"Their message today is one of confidence in their values and their country. Their message to LGBTI people is one of generosity and inclusion. Their message to politicians is clear. it is time for them to do their jobs and pass marriage equality."
Despite the similarity to Ireland's result, Brady, who formerly worked as Political Director during Ireland's referendum, says there were enormous differences too.
"The great challenge we had here was the scale of the country. In Ireland, we could get up in the morning and drive to the other side of the county, have lunch and be home again later. We don’t have that here.
"The challenge from that, was how do you make sure people in towns and villages across Australia know how powerful their vote is."
I think Australia should give @Tiernanbrady honorary citizenship, make him a Dame, and give him a kangaroo or a billabong or whatever. He did an amazing job as Director of @AMEquality. He’ll probably never come home now though. #MarriageEquality
Keith Mills, who also campaigned for a no vote in Ireland referendum, tweeted: "Congratulations to Tiernan Brady & Yes campaign in Australian marriage vote. Will be good to have him back in Ireland & to fight on the 99% of issues on which we agree."
The voluntary poll was non-binding, but Prime Minister Malcolm Turnbull immediately said he would fulfill a pledge to raise a bill in parliament with the aim of passing laws by Christmas.
"It is unequivocal, it is overwhelming. They have spoken in their millions and they have voted overwhelmingly yes for marriage equality," Turnbull told reporters in Canberra after the survey results were announced. "They voted yes for fairness, yes for commitment, yes for love."
The result marks a watershed moment for gay rights in Australia, where it was illegal in some states to engage in homosexual activity until 1997.