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Tumbuh Global, founded in 2018, is an educational consulting company that uses the principles of global citizenship education (GCED) to facilitate growth and foster belonging among adult lifelong learners.

Tumbuh (‘tomb-boo“) is an Indonesian word meaning “to spring forth or to emerge.” We chose this name for our organization at the prompting of Indonesian colleagues who believed that this word most accurately described our work in the world. Together with our global partners, we desire a springing forth of one’s truest self; personal growth through global connection.


Tumbuh Global exists to connect people across cultures, religions, and continents to build and grow global competencies. As an industry leader in GCED learning for adults, Tumbuh Global uses immersion learning experiences, online learning courses and trainings, and digital media communications to develop socially-conscious, self-aware, spiritually-grounded global citizens committed to the collective good.

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Rev. Dr. Lindsay Andreolli-Comstock

Rev. Mary Andreolli, MFA

Co-founder and Managing Director
Link to Portfolio: Coming Soon!

Co-founder and Digital Media Consultant


Link to Portfolio: Coming Soon!

Lindsay Andreolli-Comstock (she, her, hers) is co-founder, owner, and managing director of Tumbuh Global and president and principal consultant of The School of Global Citizenry. She is a global citizenship specialist, international GCED and educational design consultant, global entrepreneur, international immersion travel guide, and seasoned organizational executive with 18 years of nonprofit and B Corp-spirited for-profit experience.


Lindsay is an ordained Alliance of Baptists minister, master (120 hr.) certified TEFL English language educator, CEU certified instructor, former anti-human trafficking specialist (Southeast Asia), former refugee resettlement manager (USA), and three-time American expatriate. She has lived in 4 countries (Indonesia, Malaysia, Nepal, and Albania), traveled to more than 37 countries, spent half of her adult life living abroad, speaks fluent Bahasa Indonesia, and has been leading group travel immersions for more than 16 years.


Lindsay received her Master of Divinity (M.Div) from Baptist Theological Seminary at Richmond, Virginia and a Doctorate of Ministry (D.Min) from Louisville Presbyterian Theological Seminary in Kentucky where she recently served three years on the Alumni Board of Directors. Lindsay's doctoral thesis is focused on social justice education and adult curriculum development. She also serves on the board of the Association of Leaders in Lifelong Learning for Ministry (ALLLM) where she manages their website and social media presence. 

Mary Andreolli (she, her, hers) is co-founder and motion media design specialist for Tumbuh Global and The School of Global Citizenry. Mary is a passionate visual storyteller, 3D modeler, AR content creator, videographer, video editor, and motion designer who is deeply committed to connecting our human stories to the world's sacred narrative.


Mary created, produced, and hosted Everyday GraceTV for the North Carolina United Methodist Church (NCUMC) which is available on YouTube and Roku. She has also worked for Epic Games focused on ICVFX Virtual Production workflows in Unreal Engine 5.


Mary earned a Master of Divinity (M.Div) from Wake Forest University in North Carolina, a Master’s certificate from the Center for Cartoon Studies in Vermont, and a Master of Fine Arts (MFA) in Motion Media Design from the Savannah College of Art and Design (SCAD) in Georgia. Her master’s thesis is focused on evoking the spiritual in art through forms and patterns found in nature.


Mary is an ordained American Baptist minister, executive communications specialist with 30 years of nonprofit experience, a CEU certified instructor, has traveled to more than 65 countries around the world, lived abroad for 5 years in four different countries (Indonesia, Malaysia, Nepal, and Albania), and has been leading group travel immersions for nearly 20 years. 

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