More doing, and more donating — that’s the power of this Home Depot co-founder.

Atlanta billionaire Bernie Marcus is worth an estimated $4.53 billion, according to Bloomberg, or $5.8 billion by Forbes’ estimate. And he tells the Atlanta Journal-Constitution in a new interview that he plans to give 80% to 90% of that wealth to charity when he dies.

Marcus, 90, said that he has given more than $2 billion to 300-plus organizations across the globe in his lifetime. The Home Depot HD, +0.58% co-founder and his wife, Billi, joined the Giving Pledge launched by Microsoft MSFT, +1.57% founder Bill Gates, Melinda Gates and Warren Buffett in 2010, a commitment by the world’s wealthiest people to donate at least half of their fortunes. “To make quarterly profits is one thing, but changing just one life is so much better,” Marcus said when he joined.

Buffett also announced on Monday that he would donate about $3.6 billion in Berkshire Hathaway shares to five foundations as part of that pledge, and Mackenzie Bezos, who became one of the world’s richest women following her divorce from Amazon AMZN, +0.97% founder and CEO Jeff Bezos, also joined the philanthropic promise earlier this year.

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Marcus declined to share his net worth or predict exactly how much he’ll give away. But with his wealth guessed to be in the range of $4.53 and $5.8 billion, combined with the $2 billion he says he’s already given away, the Atlanta newspaper puts his potential total philanthropy in the ballpark of $6 billion.

He has left instructions with his Marcus Foundation to share the wealth with charitable causes. His priorities include medical discoveries and treatments for kids with autism, and creating 20 to 25 centers across the country to aid veterans suffering from brain injuries and PTSD.

“ ‘I’ve got all the houses I need. I live very well. My kids are taken care of. Everything I live for now is finding the right things to put my money into and that can give me a rate of return in emotion and doing good things for this world.’ ” — Bernie Marcus

He and his wife have also donated $250 million to build the Georgia Aquarium, and millions more to the Marcus Autism Center in Atlanta.

“Every day of my life, there are new challenges for me that I want to get involved with,” said Marcus.

And that includes politics, although not to the extent of his philanthropic giving. He told the paper that he would be donating to Donald Trump’s re-election campaign, even though “his communication sucks,” Marcus said of the president.

“He’s got a businessman’s common-sense approach to most things,” Marcus said. “Now, do I agree with every move that he makes? No, I don’t. But the truth is he has produced more than anybody else. He has. If we look at this country, I would say that we are better off today than we were eight years ago or six years ago.”

Marcus retired as Home Depot’s chairman in 2002. And he isn’t worried anymore about competition from Amazon hurting the $231 billion company that he helped start.

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Home Depot, which generates about $108 billion in annual sales, “is doing well because they understand the philosophy of reinventing themselves,” he said. “At one point, we had real concern that Amazon was going to put everybody out of business. I don’t feel that is true today. … They are not going to run away with our business.”