Chuck Feeney today is a man of no property. He and his wife Helga live in a modest rented apartment in San Francisco. He has no car or luxuries of any kind. Actually, come to think of it, he has a very nice watch. It is plastic and cost about $15.

There are no trophies or vanity photographs in the apartment to show that he has devoted his $8 billion fortune to making the world a better place.

It was always so with Feeney, a brilliant entrepreneur who became a billionaire through the company he co-founded, Duty Free Shoppers, back in the 1960s. The frugal globe-trotting philanthropist routinely flew economy class, stayed in small flats, and ordered the second-cheapest white wine in restaurants.

The key moment in Chuck’s giving career, one that was to enhance the lives of millions of people, came on November 23rd, 1984. On that day Feeney, his then wife, Danielle, and his lawyer Harvey Dale, flew to the Bahamas, a location chosen to avoid huge legal penalties for what they were about to do. They gathered in a rented conference room. At 4pm Chuck began signing a series of documents. Then they left for the airport.

While millions of Americans expressed gratitude that Thanksgiving weekend for their material blessings, Chuck Feeney felt a profound sense of relief. He had just divested himself of all that he owned, cash, businesses and shares, and placed them into a foundation he created, known today as Atlantic Philanthropies.

It was done in the utmost secrecy. Feeney continued to manage the businesses, and buy and sell properties around the world, so everyone thought he was still a billionaire, even Forbes magazine.

‘The right thing to do’ I asked Chuck more than once why he decided to give it all away. Never one for introspection he replied simply: “It was the right thing to do.”

I believe the reasons included an innately generous personality, discomfort with the trappings of wealth as a product of an Irish-American neighbourhood in New Jersey where “nobody blows their horn”, and the example set by his mother, a nurse who was always helping others.

He was also influenced by Andrew Carnegie’s essay The Gospel of Wealth, with its famous declaration that “the millionaire will be but a trustee for the poor”.

A chance invitation to join a consortium of Irish Americans to buy Ashford Castle in Co Mayo brought Chuck Feeney to Ireland in 1985.

Feeney always had a sentimental attraction to the land of his ancestors. He carried in his wallet a Thornsticks card identifying himself as an Irish American, passionately proud of Irish culture and customs but “without publicity, fanfare or personal reward”.

He hired Pádraig Berry, a graduate like himself from Cornell University School of Hotel Administration, to help find opportunities for investing in Ireland on behalf of the foundation. He started by buying the Kilternan Hotel in Co Wicklow and Heritage House on St Stephen’s Green in Dublin.

Feeney came and went, not sure at first how to help. The Irish economy in the 1980s was moribund. One in five adults were out of work. Education, he figured, was a key to recovery.

In 1987, a chance introduction by John Healy, director of the Irish American Partnership, to Ed Walsh, head of what is now University of Limerick, opened the door. Chuck began funding the institution, with the stipulation that he remain anonymous.

In the following 30 years, Feeney’s money transformed all Irish universities, revolutionised high-level research and supported the peace process and countless community causes, north and south.

His peripatetic lifestyle led him also to Vietnam and Australia, where, as in Ireland, he became the biggest donor in their history, and to Cuba and South Africa.

Another critical moment came in New York on March 3rd, 2003, when Feeney signed off on a decision to spend everything in his lifetime. “Giving while living,” he called it.

Foundations usually dole out 5 per cent annually to maintain perpetuity. Chuck wanted to do big things, especially with bricks and mortar.

“If I have $10 in my pocket and I do something with it today, it’s already producing 10 dollars’ worth of good,” he explained to me one day in his New York office, wearing a cardigan with a hole in the sleeve. “Giving 5 per cent doesn’t do so much good.”

Properties offloaded This meant selling the foundation’s properties in Ireland and elsewhere. The biggest wrench for Chuck was offloading Castletroy Park Hotel in Limerick, which he had built. It was the first modern hotel of its size in Ireland since the second World War. He would sit unnoticed in the lobby and watch how guests were treated. “It was his baby,” said former manager Áine McCarthy.

The disposal of the foundation’s assets meant the foundation could make major investments before it shut up shop.

The final initiative in 2016 was the allocation of $600 million to promote a generation of global Atlantic Fellows to create fair, healthy and inclusive societies long into the future. Of this, $177 million was assigned jointly to the Global Brain Health Institute at Trinity College Dublin and to the University of California, San Francisco, for equity in brain health.

Now aged 86, Feeney’s travelling days are over, but as he tucks into his favourite dish – chicken – in his Bayside restaurant he can reflect how his example has exploded in philanthropy.

He got a letter one day from Amit Chandra in which the Indian billionaire confided he was so inspired by Feeney’s story he has devoted much of his own wealth to creating schools, hospitals and universities. He thanked Chuck for the “joyous journey” this entailed.

As Chuck Feeney said once, it is their call what the rich do with their money, but they will get more satisfaction giving it when living than when dead. “Besides,” he added, “it’s a lot more fun.”