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Manda Ettlinger serves as the Editorial Director of Mathematics at Six Red Marbles since November 2013, overseeing the editorial department's development of print and digital mathematics products and managing project budgets and workflows. Prior experience at Houghton Mifflin Harcourt included roles as Associate Director of Mathematics, Curriculum Supervisor, Senior Curriculum Specialist, and Senior Learning Designer, where Manda led cross-functional teams, assessed vendor proposals, and managed large-scale projects. Early career roles included Math Instructor at Career Education Corporation and Adjunct Instructor at Del Mar College, alongside editorial positions at Holt, Rinehart and Winston. Manda holds a Graduate Studies degree in Instructional Technology from The University of Texas at Austin, a Master of Science in Mathematics from Texas A&M University-Corpus Christi, and a Bachelor of Arts in Mathematics from The University of Texas at Austin.