Twitter’s VP of diversity and inclusion Jeffrey Siminoff is leaving the company at the end of the month and its chief human resources officer Renee Atwood has already left, TechCrunch has confirmed.

“Renee has left the company for personal reasons,” a Twitter spokesperson told TechCrunch. “We thank her for her contributions during her time at Twitter and wish her all the best in the future.”

Atwood joined Twitter in August 2016 from Uber, where she was global head of people and places. Twitter CEO Jack Dorsey sent a note around the company letting employees know about Siminoff’s upcoming exit, one source familiar with the situation told me. The internal messaging around Siminoff was that he is leaving on his own accord, the source said.

Twitter hired Siminoff from Apple, where he was the director of worldwide inclusion and diversity, in December 2015 to replace Janet Van Huysse as vice president of diversity and inclusion. At the time of the announcement, some people were skeptical of the fact that Twitter hired a white man to lead its diversity and inclusion efforts.

These exits come shortly after Twitter unveiled its 2016 diversity report, which showed Twitter was making some progress around the hiring of underrepresented minorities. It’s not clear if Siminoff and Atwood’s departures are related, but the timing is interesting, to say the least. Update: A Twitter spokesperson told TechCrunch that the departures are unrelated.

If you haven’t been keeping track, Twitter has experienced a slew of departures at the executive level over the last year. In December, Twitter’s now-former CTO Adam Messinger left the company, along with its VP of product Josh McFarland, who left to join Greylock Partners. The month before that, Twitter lost Adam Bain, its COO.

Update at 11:40am PT: Siminoff has posted to Twitter about his departure.