Billionaire Jack Ma is reportedly stepping down from his position as executive chairman of Alibaba (BABA), the $420 billion e-commerce empire he co-founded in 1999.

Ma will officially retire on Monday, his 54th birthday, and pursue educational philanthropy, he told the New York Times.

Ma will remain on the board of Alibaba. He will focus on his Jack Ma Foundation and dedicate his time to improving education, he told the Times. A former teacher, Ma told Bloomberg TV earlier this week he might go back to teaching someday. “This is something I think I can do much better than being CEO of Alibaba,” he said.

Alibaba is one of the largest companies in China and among the most important online retail platforms in the world. As it’s grown, it has expanded into a wide array of other industries including, movies, news and cloud computing. It’s also invested money and resources in technologies like artificial intelligence and robotics.

Its affiliate company Ant Financial, China’s largest online payment platform, is valued at an estimated $150 billion.

With a personal net worth of around $40 billion, Ma is one of the richest people in China. The business leader has kept a high profile, appearing at conferences around the world and speaking to world leaders. He stepped down as CEO of Alibaba in 2013. Daniel Zhang is the current CEO of the company.

The tycoon’s retirement comes at a tumultuous time for Chinese businesses. The United States is poised to impose tariffs on $200 billion of Chinese goods, the latest round of tariffs in an escalating trade dispute between the two countries.

China is one of the world’s fastest growing major economies, but it has started to lose steam this year, and signs of further weakness are multiplying.

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Source: CNN