Twitter's executive exodus continues with the recent departure of HR chief Renee Atwood, as TechCrunch first reported and Twitter confirmed to Axios. Jeffrey Siminoff, who joined last year to lead the company's diversity efforts will be leaving at the end of the month as well.

Atwood is leaving just six months after joining for "personal reasons," according to a Twitter spokesperson, who didn't share details about Siminoff's departure other than that it was on his own accord.

Controversial pick: When Twitter hired Siminoff from Apple a year ago to head its diversity efforts, the company was criticized for picking a white man, especially given Twitter's noticeable lack of diversity among its employees.

However, the company showed progress over the past year when it released its workforce diversity report last month. It now employees slightly fewer white employees and more women than it did a year ago, and it's added underrepresented minorities to its leadership ranks, up from having none in 2015.

What's next? It's unknown who will replace Atwood and Siminoff, and whether they'll last longer. Twitter has lost multiple executives and employees over the past two years and despite CEO Jack Dorsey's best efforts, it doesn't seem to be over.