Principal's Page
Principal Mrs. Cindy Mills

Welcome to Greenbrier Elementary – Home of the Sidewinders!
It is both an honor and a privilege to serve as the principal of this incredible school. As I enter my third year at Greenbrier and my 28th year in education, I continue to be inspired each day by our students, staff, and families.
I am an Arizona native, born and raised in the West Valley. I hold a Bachelor’s degree in Elementary Education from Ottawa University and a Master’s degree in Educational Leadership from Northern Arizona University. My journey in education began right here in DVUSD, where I taught for seven years before stepping into leadership roles in neighboring districts. After many wonderful years as an administrator, I was thrilled to return to DVUSD and become part of the Greenbrier community.
At Greenbrier, we believe that all children are capable of success — no exceptions. When students are given a safe and supportive environment, a growth mindset, and passionate educators who make learning engaging and meaningful, extraordinary things happen. Our goal is to foster a sense of community, curiosity, and confidence in every Sidewinder who walks through our doors.
On a personal note, I am blessed with two amazing adult children, Darren and Jennifer, who both attended DVUSD schools and still live in Arizona. I now have three wonderful grandchildren who bring so much joy to my life. In my free time, I enjoy Arizona’s beautiful sunshine, swimming, golfing, listening to music, and visiting the beach whenever I can.
Thank you for being a valued part of our Sidewinder family — or for considering becoming one. I look forward to an amazing year of growth, learning, and connection together.
Your partner in education,
Cynthia Mills, M. Ed.
Principal, Greenbrier Elementary
Assistant Principal Mrs. Lisa Grant
I am excited to introduce myself as your new Assistant Principal.
My name is Lisa Grant, and I am honored to join the Deer Valley Unified School District.
I have spent the last 22 years in elementary education, including three years as a district-wide
ELA Academic Coach for Queen Creek Unified School District. In this role, I collaborated with
teachers, reading specialists, and school leaders across ten elementary schools to strengthen
literacy instruction and accelerate student achievement. Previously, I taught kindergarten
through fourth grade for 19 years and led summer school math for grades third through sixth.
Outside of work, I enjoy traveling to see my family in Prescott, relaxing in the pool, and listening
to live music. My husband and I enjoy exploring new places, and our daughter recently earned
her master’s degree in cybersecurity from Embry-Riddle.
Cheers to a great year ahead,
Lisa Grant