NEW YORK (AP) – Philanthropist David Rockefeller is celebrating his 90th birthday by giving gifts away.

He donated $100 million to Rockefeller University on Wednesday and $100 million to the Museum of Modern Art in April, and he says more generous gifts are on the way for other institutions that played important roles in his life.

“Now that I am getting to be 90, I thought it was time to take stock of my past and present,” Rockefeller told The Associated Press on Thursday. “It was time to provide more funds to these institutions that I have been involved in since I was a child. I feel fortunate to have the resources so I can do it.”

Rockefeller, whose birthday is Sunday, is the brother of the late Gov. Nelson Rockefeller and only surviving grandchild of John D. Rockefeller, a Standard Oil Co. magnate. He is listed by Forbes magazine as one of the 100 wealthiest Americans, with an estimated $2.5 billion.

The donation to Rockefeller University, founded by his grandfather more than a century ago, is earmarked for the school’s science and research graduate program, for its laboratories and for modernization of its campus, located on Manhattan’s East side. The university said it’s the largest gift it has ever received.

The $100 million gift for MoMA, which Rockefeller’s mother helped found, is on top of another $100 million donation bestowed years earlier and a $5 million-a-year donation committed for the rest of Rockefeller’s life.

The latest gifts brings Rockefeller’s total lifetime donations to more than half a billion dollars.

Rockefeller said that with opportunity goes responsibility.

“My parents and grandfather instilled that in us, not by preaching but by actions,” he said. “It gives me great satisfaction.”

He said he plans gifts for Harvard University, where he studied as an undergraduate, and the Maine Coast Heritage Trust, started by his late wife, Peggy Rockefeller.

Rockefeller retired nearly 25 years ago as chairman of Chase Manhattan Bank but continues to put in full days at his office in Rockefeller Center, devoting time to a new book, a collection of his photographs with renowned people he met.

Rockefeller said that after he completes his gift spree he plans join family members in southern France for a big birthday bash.

AP-ES-06-10-05 0714EDT