Callie Harvey joined the TRIS community in 2012, shortly after she and her family moved to the Bay Area from Canada. She attended a Montessori primary program as a child and is at home with both the materials and the approach.  She has lived in France as a Vivre Sans Frontières exchange student who obtained the baccalauréat diploma in French literature and as a college student who studied at the Sorbonne University.  She holds a Bachelor of Arts in French from Bryn Mawr College in Pennsylvania and a Master of Arts in Linguistics from Leiden University in the Netherlands.

Her AMI Primary certificate is from the Montessori Teacher Training Center of Northern California.  In addition to French, she understands Spanish, some Dutch, and some Russian. One of Callie’s favorite aspects of working at TRIS is collaborating with the wonderful families and the inspiring faculty.  Teaching French pastry camp over the summer is a definite perk, too!


Priscilla Medina
was born and raised in the Bay Area. Her family is from Mexico. Priscilla has a background in Child Development as well as training  from The Montessori Teacher Education Center San Francisco Bay Area (AMS). She is the Spanish assistant at the primary level at TRIS who enjoys the Montessori philosophy.  She has been a part of the TRIS community since winter of 2015.


Yax Xiong is an AMI Montessori guide from California. She completed her AMI Primary training at the Montessori Northwest training center. She holds a B.A. degree in International Economics and Business from Capital University of Economic and Business of Beijing, China and a Masters of Education degree in Montessori Primary from Loyola University in Maryland. During her free time, she enjoys reading, spending time with her family, attending music programs, and exploring the great outdoors. She joined TRIS in September 2019.