Marietta City Schools Superintendent Emily Lembeck, announced her retirement after serving in that position for 12 years.

Lembeck said he will step down Dec. 31.

“Being a superintendent is more or less a 24/7, 365-day a year job. And it’s an opportunity to make a great, great difference,” she said.

But after nearly 30 years in education, most of those with Marietta, and with five grandchildren, she is ready to step away from full-time work to spend more time with her husband and family.

“This is not a job that you can walk into and out of from 9 to 5,” Lembeck said.

Marietta schools enroll about 8,900 students, and the school board will begin the search for her replacement.

Under her direction, Marietta City Schools has advanced and improved, leading to Lembeck being named Georgia superintendent of the year in 2012. Under her direction, Marietta became one of Georgia’s first charter school systems in June of 2008. The system is also an International Baccalaureate World School district and won other distinctions.

She also has served in many local and state community organizations such as the Governor’s Office for Children and Families, Georgia Children’s Cabinet and she has a long-term affiliation with the Georgia Partnership for Excellence in Education.

Lembeck announced the resignation at a school board meeting earlier this week.