Great Work, Inc is humbled and happy to relaunch the Association Montessori Internationale (AMI) Primary Training that was previously presented by the late Elizabeth Hall of Denver, Colorado. We acknowledge her presence as a longtime trainer of teachers at the primary and assistants to infancy level, and was a staple in the Montessori community in Denver and around the globe.


Great Work, Inc. has the bold mission to serve the community through the vision of Dr. Maria Montessori that includes providing opportunities steeped in dignity for youth and those who work with youth. Our practices have equity at the core of how we begin to enroll and recruit trainees from diverse backgrounds that reflect our multiculturalism, along with different socioeconomic backgrounds, religion, age, and gender identities.

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Jack Yu is a primary trainer for the Association Montessori Internationale (AMI). Jack holds Primary and A to I diplomas from AMI. He also has a B.A. in Social Work from Soochow University, Taiwan. He was a social worker prior to working with young children. After he went through the trainings, he performed different roles in Montessori schools as toddler guide, primary guide, pedagogical director and consultant serving children and families from diverse backgrounds. Over the years, he has translated Assistants to Infancy, Primary and Elementary training courses from English to Mandarin in the US and China. He has also done primary assistant certificate training which were well attended.


The profound difference that exists between our method and the so-called “objective lessons” of the older systems is that the objects are not a help to the teacher.
— The Discovery of the Child, Dr. Maria Montessori