Explore Keystone People

Laura Hertzler

Head of School

Ms. Laura joined Keystone in 2011. Ms. Laura is responsible for the school's vision...

Stefan Linder

Associate Head of School

Mr. Stefan joined Keystone in 2002. He earned his Bachelor of Education from Feder...

Heather Bonacorda

Admissions & Marketing Director

Ms. Heather joined Keystone in 2019. She holds an American Montessori Society Early Chi...

Sue Smith

Office Manager

Ms. Sue joined Keystone in 2004. Ms. Sue maintains students’ registration, attend...

Gina Giorsetto

Administrative Assistant

Ms. Gina joined Keystone in 2021. She holds an Associate’s Degree in Early C...

Michael Cho

Facilities Manager

Jeremy Stepp

Special Education Director

Mr. Jeremy joined Keystone in 2017. He has an Associate‘s degree in Education fro...

Melissa Sutton

Development Director

Ms. Melissa joined Keystone in 2018. She is responsible for the Sustaining Fund and Tax...

Kristin Morgan

Business Manager: Aspire Business Consultants

Kristin Morgan joined Keystone in 2016 and assists the school with business office func...

Marcus Albert

Special Education Support Staff

Mr. Marcus joined Keystone in 2022. He worked as a Home Liaison for Quest Charter Acade...

Mia Alfonso

Spanish Guide

Ms. Mia has worked at Keystone since 2003 as the Elementary Spanish Guide. She holds a ...

Amie Allor

Elementary Guide - Red-tailed Hawks

Ms. Amie joined Keystone in 2003. She holds an American Montessori Society Elementary c...

Consuelo Arellano

Children's House Bilingual Assistant- Saguaros

Ms. Consuelo joined Keystone in 2018. She is from Lima, Peru, and c...

Alejandra Aviles

Elementary Assistant - Red-tailed Hawks

Ms. Alejandra joined Keystone in 2022. She has a Bachelor's Degree in Psychology fr...

Anny Aziz

Children's House Bilingual Assistant - Palos Verdes

Ms. Anny joined Keystone in 2019. She holds a bachelor's degree in physical th...

Christina Bergstrom

Special Education Teacher

Ms. Christina joined Keystone in 2022. She has a Bachelor of Science in both Special Ed...

Anasazi Brewton

Toddler Guide - Agaves

Ms. Anasazi joined Keystone in 2021.  She holds a master's degree in Bili...

Janelle Chamberlain

Elementary Assistant - Iguanas

Ms. Janelle joined Keystone in 2014. She worked as a paraprofessional & classroom a...

Mar Cubillo

Children's House Bilingual Assistant- Prickly Pears

Ms. Mar joined Keystone in 2021. She is originally from Barcelona, ​​Spain. M...

Shahnaz Currim

Elementary Guide - Coyotes

Ms. Shahnaz joined Keystone in 2011. She holds Elementary and Primary Diplomas from Ass...

León Dantus

Adolescent Guide - AZ Eagles

Mr. Leon joined Keystone in 2004. He has his Montessori Orientation to Adolescent Studi...

Gerry DeLaTorre

Music Specialist

Mr. Gerry joined Keystone in 2009. He holds a degree in Business Administration from th...

Silvia Escobar

Children's House Assistant - Saguaros

Ms. Silvia joined Keystone in 2022. She is originally from El Salvador, where...

Samantha Evans

Elementary Guide - Gila Monsters

 Ms. Samantha joined Keystone in 2022. She holds an Elementary Diploma from Associ...

Danielle Ghorayeb

Children's House Support Staff & Movement

Ms. Danielle has worked at Keystone since 2009. She holds a Bachelor of Science Degree ...

Iris Guevara

Toddler Bilingual Assistant - Agaves

Jacqueline Hale

Reading Specialist

Ms. Jacque joined Keystone in 2022. She has a bachelor's degree in Education Specia...

Erika Huerta

Elementary Assistant - Coyotes

Erika joined Keystone in 2019. She holds a Bachelor of Secondary Education and Speciali...

April Knight

Elementary Guide - Scorpions

Ms. April joined Keystone in 2011. She holds a bachelor’s degree in Fine Arts and...

Bahareh Kompani

Elementary Assistant - Great Horned Owls

Ms. Bahareh joined Keystone in 2015. She has an associate's degree in Computer...

Masonn Longoria

Elementary Assistant - Gila Monsters

Mr. Masonn joined Keystone in 2022. Born and raised in Arizona, he graduated from Trevo...

Daniela Lopez

Children's House Assistant- Prickly Pears

Ms. Daniela joined Keystone in 2021. She is originally from Mexico City, Mexico and has...

Jess Morales Ruán

Elementary Guide- Great Horned Owls

Mr. Jess joined Keystone in 2020. He holds a Bachelor of Business Administration Degree...

Sergio Mukokomani

Support Staff

Mr. Sergio joined Keystone in 2022. He is from Denver Colorado and recently g...

Sara Oaxaca

Elementary Guide - Diamondbacks

Ms. Sara joined Keystone in 2018. She holds a Masters of Education (Montessor...

Alejandra Padilla

Support Staff

Ms. Alejendra joined keystone in 2016. She has a bachelor’s degree in Advert...

Katty Padilla

Elementary Guide - Iguanas

Ms. Katty joined Keystone in 2017. She received her Montessori training from Instituto ...

Ben Peterson

Support Staff

Mr. Ben joined Keystone in 2016. He is a Keystone alumnus and currently attending Arizo...

Barbara Rosales

Special Education Clerical Support Staff

Ms. Barbara joined Keystone in 2022. She has a nursing assistant diploma from Broo...

Keny Rosales

Children's House Assistant - Palos Verdes

Liz Schiavone

Elementary Assistant - Scorpions

Ms. Liz joined Keystone in 2021. She holds a bachelor’s degree in Rehabilitation ...

Sarah Skroch

Special Education Support Staff

Ms. Sarah joined Keystone in 2022. She is originally from Minnesota, an...

Mia Soard

Toddler Assistant - Agaves

Ms. Mia joined Keystone in 2016. She is a Keystone alumna and is currently attending Ch...

Whitney Stockhauser

Adolescent Guide - AZ Eagles

Ms. Whitney joined Keystone in 2018. She holds a Bachelor of Arts in Elementary Educati...

Nate Tunstall

Elementary Assistant - Diamondbacks & Elementary Extended Care Coordinator

Mr. Nate joined Keystone in 2021. He was born and raised in Phoenix, Arizona.  In ...

Imelda Urbiztondo

Children’s House Guide - Palos Verdes

Ms. Imelda joined Keystone in 2002. She holds a Bachelor degree in Elementary Educ...

Abby van Vianen

Adolescent Guide - AZ Eagles

Ms. Abby joined Keystone in 2021. She earned her bachelor's degree in Elementary Ed...

Blanca Villalobos

Children’s House Guide - Prickly Pears

Ms. Blanca joined Keystone in 2016. She holds a Bachelor of Arts in Elementary Educatio...

April Winner

Special Education Teacher

Ms. April joined Keystone in 2022.  She has a bachelor’s degree in Human Com...

Chelsei Winstead

Interim Toddler Guide - Agaves

Ms. Chelsei joined Keystone in 2021. She has a certificate in Veterinary Medicine ...

Yoo-Kyung Yoo

Children‘s House Guide - Saguaros

Ms. Yoo-Kyung joined Keystone in 1995. She holds a Bachelor of Arts from Yonsei Univers...

Ana Zikic

Elementary & Adolescent Art Guide & Yoga Instructor

Ms. Ana joined Keystone in 2011. She holds a Bachelor of Arts Degree in Fine Art f...