2009-2013
One Schoolhouse began as the Online School for Girls in the winter of 2009.  Four independent girls’ schools -- Harpeth Hall School (Nashville, TN), Holton-Arms School (Bethesda, MD), Laurel School (Cleveland, OH), and Westover School (Middlebury, CT) -- formed a non-profit consortium to become the world’s first single-gender online school and the world’s first online independent school: the Online School for Girls.  They came together with the common beliefs that online education was an increasingly powerful way to learn and that there was great value in creating an online learning environment is built on the traditions of independent schools and girls' schools.

In the early years, the organization expanded rapidly. During the 2010-2011 school year, Molly Rumsey, an original Trustee and an experienced teacher and administrator from Harpeth Hall School, served as the interim Director. By the end of Mrs. Rumsey's tenure, the organization added eight founding schools and thirty-six affiliates, and had started a professional development program. 

​The organization hired Brad Rathgeber to be the first Executive Director for the 2011-2012 academic year. In his first two years of leadership, the organization's enrollment doubled each year, and the academic program expanded student course offerings even further, adding World Language courses, new STEM offerings and additional social science courses.  The organization also launched successful collaborations with the National Association of Independent Schools, the National Business Officers Association, and many regional independent school associations.  And, in October of 2011, the organization was given full accreditation by the Middle States Association of Colleges and Schools.

2013-2017
​By the start of the 2013-2014, the Online School for Girls had established itself both as an exceptionally high quality academic program and a thought-leader in online and blended learning.  Student and professional development courses expanded to meet the needs of the consortium schools. The academic program also began a journey into the field of personalized learning, discovering how a learner-driven pedagogical approach could more fully meet the mission of the organization, and, more generally, the promise of independent schools to value the uniqueness of each child. 

Building on the great success of the organization in the first six years, in the winter of 2016, the Board of Trustees approved a new mission and a new name for the organization, launching One Schoolhouse, and a new all-gender program. All-gender courses launched in the fall of 2016.

2017-2019
By 2017, the academic program committed to two core competencies around which all learning in the academic program is organized.

Engaging constructively in a diverse and changing world.
Students develop an inclusive world view when they encounter people and ideas that are different from their own, practice empathy, work collaboratively, defend their position with facts respectfully, and demonstrate mastery through real-world application. 

Gaining academic maturity.
Courses are scaffolded to promote iteration and designed to reward persistence.  Students practice responsibility, intellectual adaptability, interpersonal flexibly, self-regulation and organization, and a range of communication skills. 

In 2019, the School merged with the Independent Curriculum Group (ICG), bringing the talent and resources of ICG together with the School's for the benefit of the independent school community worldwide.  

2020-2022
Because of the One Schoolhouse's experience with both online learning and professional development, when the COVID-19 pandemic hit, the organization was poised to help.One Schoolhouse distributed resources and advice in varied ways: a widely visited resource web page, a weekly webinar series, weekly newsletters, online courses, speaking engagements, and more. Tens of thousands of educators interacted with One Schoolhouse resources over the course of 2020, and the consortium grew to more than 250 schools. 

With the COVID-19 pandemic, One Schoolhouse worked with and developed resources for Academic Leaders in independent school more than ever before. By the beginning of 2022, the organization had: newsletters, courses, meet-ups, in-person events, webinars, and more... all of the components of an association, and so One Schoolhouse launched an Association for Academic Leaders in independent schools. 

In addition, with a greater need for student online learning because of the COVID-19 pandemic, the academic program more than doubled in size during this period. This allowed the academic program to recommit and expand its work in equity, inclusion, and belonging, with the introduction of new course standards and an additional instructional designer focused on these efforts.
Online School for Girls Logo 2009-2010
Online School for Girls Logo - 2010 - 2014
Online School for Girls Logo - 2014 - 2016
One Schoolhouse Logo - 2017-2022