Lisa Borders has stepped down as the president and CEO of Time's Up.
She made the announcement on Twitter Monday, citing "family concerns."
Borders became Time's Up's first president and CEO after heading the Women's National Basketball Association. She's also a former vice president of global community affairs at The Coca-Cola Company.
The Time's Up movement just marked its first anniversary on Jan. 1. More than 1,000 women in the entertainment business created the campaign to combat sexual assault, harassment and inequality in the workplace.
In her goodbye statement, Borders said, "I appreciate the opportunity to support this mission and I hope my efforts will continue to resonate."
Time's Up issued a statement of its own, saying, "We know that it is the right decision for Lisa as well as the organization."
Time's Up said its COO, Rebecca Goldman, will serve as interim CEO while it searches for Borders' replacement.