Twitter has hired Candi Castleberry-Singleton as its new vice president of inclusion and diversity, in an attempt to make the social media service better reflect the demographics of its users, USA Today reports.

The social media site, which has come under fire for the lack of women and people of color in its ranks, has had three diversity chiefs. Siminoff replaced Janet Van Huysse in 2015. At the time, hiring a white man to lead diversity efforts ignited controversy across all social media platforms.

“I’m so excited to join the team at Twitter to lead inclusion and diversity efforts for employees and the Twitter community,” Castleberry-Singleton said in a statement.

Castleberry-Singleton, who has spent years working in the field of inclusion and diversity for major corporations, replaces Jeffrey Siminoff, who stepped down in February.