WhatsApp cofounder Brian Acton

WhatsApp cofounder Brian Acton is planning to leave the company he helped create. Acton described his motivation for the move in a Facebook post Tuesday evening. He will transition his responsibilities to other engineers at the company and officially leave in November, a source familiar with the matter told VentureBeat.

“I’ve decided to start a nonprofit focused at the intersection of nonprofit, technology, and communications,” Acton wrote. “It’s something I’ve thought about for a while, and now it’s time to just focus and execute. I’ll have more to share in the coming months.”

Forbes estimates Acton’s net worth to be $6.5 billion. Acton had been in charge of the company’s engineering team, according to Recode.

In 2009, Acton launched WhatsApp with now-CEO Jan Koum. Over the years, WhatsApp became one of the most-used chat apps on the planet, and today it has 1.3 billion monthly active users and 1 billion daily active users. In 2014, WhatsApp was sold to Facebook for more than $16 billion.

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SOURCE: Business Insider, Khari Johnson