Bryan Sivak, chief technology officer at the U.S. Department of Health and Human Services, will be leaving in April. No word yet about what's next for him.

Sivak is known for pushing innovation at HHS.

HHS Secretary Sylvia M. Burwell announced Sivak's impending departure in an email to staff.

He joined HHS in June 2012, succeeding Todd Park, who had left the post for one as White House CTO.

[See also: HHS names Sivak as CTO.]

He and Park seemed of the same ilk, always advocating to set data free, and proud to be disruptive.

"We are sitting on a vast treasure trove of data that can be used in any number of ways – things that we’ve seen and things we can’t even begin to imagine – and it has the power to fundamentally transform healthcare and the delivery of human services," Sivak told Executive Editor Tom Sullivan in a July 30, 2013, interview.

[See also: Bryan Sivak: Chief disrupter at HHS.]

At HHS, Sivak was known as the CTO, but also as entrrepreneur in residence.

Before joining HHS, Sivak had served as chief innovation officer for the state of Maryland.

Before he came to public service, he founded InQuira, a Silicon Valley knowledge management and self-service software company, which was later acquired by Oracle.