Sally Bradshaw resigned from the state Board of Education on Sunday, two months before her term was scheduled to end.
Her resignation is effective immediately.
Bradshaw, a one-time chief of staff to former Gov. Jeb Bush, had served on the education board since September 2011. In a letter to Gov. Rick Scott dated Oct. 13, she wrote that "family obligations through year's end" would prevent her from fully completing her term.
Education Commissioner Pam Stewart said she was "sad to see Ms. Bradshaw go."
"She was a great asset and I consider her a friend," Stewart added. "But I commend her for making the decision she made, choosing family over volunteer work. It was the right decision to make."
Scott did not say when he planned to name a replacement.
"We are grateful for Sally's service and commitment to ensuring the highest quality in our education system," he wrote in a statement. "She has worked hard to continue the legacy of high standards that began under the great leadership of Gov. Jeb Bush."
Scott has already named a replacement for outgoing board member Kathleen Shanahan, whose term also ends in December.
His pick: Rebecca Fishman Lipsey, the former executive director of Teach for America Miami-Dade.
Barbara Feingold's term on the education board ends in December, too.
The board meets in Tampa at 9 a.m. Tuesday to discuss which exams will accompany the new Common Core State Standards (and replace the Florida Comprehensive Assessment Tests). They will also finalize the state's decision to reject the Common Core State Standards appendices, sample performance tasks and student writing samples.
Later, members of the public are invited to share their thoughts on the standards at Hillsborough Community College. The Department of Education has more information on the 5 p.m. meeting here.
"This is another opportunity for people to come out and talk about the standards, and what they see as the strengths and what they believe needs to change," Stewart said.
Stewart said she also hopes to clear up misconceptions that the Common Core standards are a national curriculum. "None of us want the national government determining our curriculum," she said. "Those are decisions that should be made on a local level."