Jina L. Choi, director of the U.S. Securities and Exchange Commission’s San Francisco regional office, is set to leave her post at the end of this month, the agency announced Thursday.

Choi, a Chicago native and career SEC enforcement lawyer, has been at the SEC for more than 16 years and has led the agency’s San Francisco office since 2013. During her tenure, the San Francisco office has brought enforcement actions involving Tesla and the Twitter activity of its CEO Elon Musk, fraud allegations against Theranos and its founder Elizabeth Holmes, and inadequate disclosures by Yahoo Inc. about a series of data breaches.