Isabel Arce García is the Secondary Level Coordinator at Instituto Nueva Escuela, in Río Piedras, Puerto Rico. She worked for 28 years as a teacher in La Nueva Escuela Juan Ponce de León; eleven of those as a Secondary Level I & II certified Montessori guide. She has been part of the Secondary Level training staff since 2015.

Khairieh Al Kalam has been a certified Montessori Trainer for thirteen years now. Currently, she works at the Sharjah Education Academy in the  United Arab Emirates and trains in different countries. She earned her Montessori diploma 23 years ago and started to work as a teacher and then a Principal in addition to her work as a trainer.