The Securities and Exchange Commission (SEC) announced the appointments of Natasha Vij Greiner and Keith Cassidy as interim acting co-directors of the Division of Examinations.

They will oversee the division while Director Richard Best is on extended medical leave, the SEC said in a press release Tuesday.

“My thoughts are with [Best] as he’s away from the agency on medical leave,” said SEC Chair Gary Gensler in the release. “I thank [Greiner] and [Cassidy] for stepping in on an interim basis to lead the Division of Examinations. They are both strong leaders who have earned the respect of their colleagues throughout the agency.”

Greiner has been with the SEC for more than 21 years, including with the Division of Trading and Markets and the Enforcement Division.

Cassidy is the national associate director of the division’s Technology Controls Program. He previously held positions at the SEC’s Office of Legislative and Intergovernmental Affair and the Department of Justice’s Office of Legislative Affairs.

The SEC’s Division of Examinations was formerly called the Office of Compliance Inspections and Examinations.