Lower School

Amy Rangel

Amy Rangel has her Master’s degree in Interdisciplinary Studies with an emphasis on Child Development. She worked at Children’s Medical Center for 11 years as a Child Life Specialist. She also teaches at Brookhaven Community College in the Child Development/Teacher Preparation Department. She has been at Vanguard since 2015.

Brooke Guilfoyle

Brooke is from Conway, Arkansas and earned her Bachelor of Science in Health and Physical Education at Arkansas Tech University. In between her teaching experiences, she served in the U.S. Air Force where she was an Air Traffic Controller. She is currently pursuing her Master of Education in K-12 Education at Arkansas Tech. In her free time, she enjoys spending time powerlifting, traveling the country, and spending time with her husband, Daniel, and three dogs, Rocco, Scout, and Timmy.

Devin Warren

Devin Warren graduated from the University of North Texas with a Bachelor’s in Social Work and a minor in Family Studies and Child Development. Devin loves working at Vanguard as the lead Pre-K and Kindergarten teacher and has over 15 years of experience working with this age group. She has a passion for working with children and strives to provide a safe, loving environment for the children in her class. When Devin is not teaching, she loves spending time with her four children and husband.

Julie Himpelmann

Julie has a Master of Arts in Special Education from the University of Texas of the Permian Basin. After more than four years as a parent volunteer at Vanguard, Julie joined the team in a more permanent role as a lower school Teacher Assistant in 2020. She has a passion for working with Vanguard’s youngest students to help them discover their strengths, grow their confidence, and nurture their independence..

Stefany Cruz

Stefany attended Austin College where she majored in Chemistry and minored in Theatre. She is a Registered Behavior Technician and has years of experience working with children of all ages and backgrounds. Her goal is to provide each child with the tools needed to flourish. In her free time, Stefany enjoys spending time with her family by a beach or on a hike.

Tanya Goforth

Tanya has a Bachelor of Science degree in Early Childhood Development, a Master’s degree in Early Childhood Education, and has been in the field of education since 2006. She has experience as a Registered Behavior Technician, is a Reading Intervention Specialist, and has an Elementary Masters of Teaching certification. 

Vanguard Preparatory School

4240 Sigma Road Dallas, TX 75244 | phone: 972.404.1616 | fax: 972.404.1641 | email: info@vanguardprepschool.com

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