A long-running joke among Colorado education officials, policymakers and activists is that only a handful of people really know how Colorado’s complex school funding system works.

One of those people — Leanne Emm, the state’s education department’s deputy commissioner — is retiring later this month after nearly 30 years in public service.

Emm announced her retirement in an email to other school finance officers late last month. Her last day at the department is Sept. 22.

“Each of you helps your students, communities, stakeholders and decision makers with a huge array of issues,” she said in her email. “I can only hope that I will have helped contribute to an understanding of budgetary pressures that we have within the state.”

Emm was appointed to her position in 2011 — about the same time the state’s schools were grappling with deep budget cuts due to Great Recession. She worked at Jeffco Public Schools for 14 years before joining the education department.

Katy Anthes, the state’s education commissioner, said Emm’s exit will be felt at both the state and local school district level.

“Leanne’s leadership and her deep knowledge of the school finance system will be sorely missed by all of us at CDE and by the districts she has supported over the years.” Anthes said in a statement. “I will be forever grateful for her support as I transitioned to this role. I’m sad to see her leave CDE, but I suspect that her love for the state of Colorado and passion for improving education will cause our paths to cross again.”