Barclays Global Investors has announced that its global CEO, Patricia Dunn, is stepping down to focus on treatment and recovery from breast cancer and melanoma.

Dunn will be succeeded by Blake Grossman and Andrew Skirton, who have been appointed Co-Global CEOs of BGI. Dunn will continue to serve the firm in a non-executive capacity as vice chairman of BGI.

Grossman has been with the firm since 1985, and Skirton has been with the firm since 1989. Both have been members of the firm’s Global Management Committee. Grossman has most recently been chief investment officer of the firm’s Global Advanced Active business, responsible for the growth and strong performance of its active strategies.

Skirton, most recently was co-CEO of the firm’s Global Index & Markets Group, with global responsibility for index fund management, securities lending, transition services, and cash management. He is a board member of Barclays Global Investors Limited.

“Under Pattie’s leadership, BGI has distinguished itself as a unique global asset management firm offering tremendous value to institutions, financial intermediaries, and individual investors,” said Matthew Barrett, Group CEO, Barclays plc. “BGI’s business performance is strong due to its clear value proposition for clients, its depth of talent, and its leadership in investment management. I have full confidence that it is well positioned for the future.”

“Deciding to step down as CEO has been a tough decision,” said Dunn. “My entire career has been with BGI, and I could not be prouder of its accomplishments and people. I feel confident that refocusing my priorities on health is the right move because the business is in a great position, performing strongly, and has exceptional depth. I know Blake, Andrew and the entire team will carry on with great success.”