Jack Ma, the billionaire who ushered e-commerce into China, is officially stepping down as Alibaba's executive chairman on Tuesday. He's celebrating his retirement with a big bash at an Olympic-sized stadium in the company's hometown of Hangzhou.

After two decades building Alibaba into a $460 billion business, Ma is now pivoting full time to philanthropy. He started the Jack Ma Foundation in 2014, and has cited the Bill and Melinda Gates Foundation as an inspiration for his charitable endeavors.

"Jack has been signaling for some time his interests in philanthropy, environment, women's empowerment, education and development," said Duncan Clark, the author of "Alibaba: The House That Jack Ma Built."

The eager teacher

"Before I'm 70 years old, I can do something in other fields, in areas like education," Ma said at an Alibaba event last September.

Ma announced his intention to resign a year ago. Even after stepping away from Alibaba's senior management and board, he is expected to continue to shape the company's future through his lifetime membership with the Alibaba Partnership, a group of 36 people that can nominate a majority of the directors to the board. He also retains a 6.22% share of the company. Alibaba CEO Daniel Zhang will also take on the role of chairman from Ma.

A Communist Party member, Ma is China's most famous entrepreneur and — with a fortune of nearly $40 billion — the country's richest man.

But he's also a former English teacher, and has often talked about his passion for education. The date that Ma chose to formally step down, September 10, is Teachers' Day in China, "so there's some messaging in that," Clark said. It's also Ma's 55th birthday.

Ma referenced his previous career to explain why he was stepping down from his company.

"Teachers always want their students to exceed them, so the responsible thing ... for me and the company to do is to let younger, more talented people take over in leadership roles," Ma said last September.

Last year, Ma spoke about the challenges for the future of education at the World Economic Forum, warning that "if we do not change the way we teach, 30 years later we will be in trouble."

The current knowledge-based approach of teaching will "fail our kids" who will never be able to compete with machines, Ma said. Children should be taught "soft skills" like independent thinking, values and teamwork, he added.

In 2017, Ma's foundation pledged $45 million over 10 years to help discover and cultivate future teaching talent in rural China.

Ma has also taken his teaching beyond China to other emerging markets, according to Clark.

The tech tycoon has been "sharing his perspectives and experience in business in places like Africa," Clark said, where he has established a $10 million entrepreneurial prize. Ma has also funded wildlife protection initiatives and developed good relations with African leaders like Paul Kagame in Rwanda.

Supporting women

Ma and Alibaba have hosted a biennial conference in China on women and entrepreneurship since 2015. The events have drawn names such as Arianna Huffington and Vera Wang. This year's conference included a video message from Rihanna.

"Women have always played an integral role in Alibaba since its establishment two decades ago," Ma said at the conference last month, according to a report published by the company's news site Alizila.

Ma said that gender equality is one of the most-important issues in the 21st century, noting that "if you want your business to succeed, it is critical to appoint enough female leaders."

Nearly half of Alibaba's senior management team are women. (CNN)

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