Facebook Inc said on Thursday Chief Product Officer Chris Cox will leave the social media network after 13 years, adding to a recent string of high-profile exits.

Also departing is WhatsApp Vice President Chris Daniels, Chief Executive Officer Mark Zuckerberg said in a blog post. The company does not immediately plan to appoint anyone to fill Cox’s role in the near term, he said.

Cox, among the first Facebook hires, gained oversight of WhatsApp and Instagram following the exits of their founders. In September, Instagram co-founders Kevin Systrom and Mike Krieger resigned as chief executive officer and chief technical officer of the photo-sharing app owned by Facebook.

Jan Koum, the co-founder of WhatsApp, left in April last year.

“As Mark has outlined, we are turning a new page in our product direction, focused on an encrypted, interoperable, messaging network. …This will be a big project and we will need leaders who are excited to see the new direction through,” Cox said in a Facebook post.

Will Cathcart, vice president of product management, will now lead WhatsApp and Head of Video, Games and Monetization Fidji Simo will be the new head of the Facebook app, Zuckerberg said.
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