NEW YORK, NY, USA - Serena and Venus Williams are adding their voices to the campaign for equal pay in the workplace after it was announced they have joined the advisory board of the Billie Jean King Leadership Initiative (BJKLI).
The BJKLI was founded in 2014 by King to promote equality and inclusion across all types of job.
"I'm thrilled to announce that my dear friends, Serena and Venus Williams, have joined the BJKLI advisory board," said the 39-time Grand Slam winner.
"Without a doubt, they are two of the foremost athletes of their generation and true forces in challenging the public discourse on equality in sport and society.”
King and the Williams sisters first met at a World TeamTennis clinic in Long Beach, California, when Serena and Venus were children.
They also worked together on the court when King was the captain of the US Fed Cup and Olympic teams.
In 2016, Serena and Venus teamed up to establish The Williams Sisters Fund, which seeks to support various philanthropic efforts. Their first project, The Yetunde Price Resource Center, was created in honor of their late sister, Yetunde Price.
Serena said: "Billie Jean has been an inspiration to me on and off the court, and I am excited to play a role in shaping the future of the organization and driving its mission forward."