Leadership

KIMBERLY DEWRELL
I bring more than 20 years of experience in education, working with students from Kindergarten through 8th grade across various roles and learning environments. I’ve served as a 5th and 6th-grade teacher, a K–8 Instructional Coach/Staff Developer, a Middle School Vice Principal in Montgomery Township (NJ), Principal at J.F. Tatem Elementary in Haddonfield, and Assistant Principal at Hill Country Middle School. I am entering my third year as Principal of Hill Country Middle School.
Throughout my leadership journey, I’ve prioritized cultivating a school culture built on trust, collaboration, and high expectations. At HCMS, I lead with the belief that how you choose to live matters, a message we embed daily through our Cougar Clues of Respect, Honesty, and Pride. I am committed to modeling resilience, reflective practice, and service-centered leadership. Whether supporting teachers with instructional growth, guiding students through life’s challenges, or partnering with families, my goal is to ensure every learner feels seen, supported, and inspired.
Middle school is challenging and exciting to lead. It’s a time of rapid physical, emotional, academic, and social transitions, but it is also one of great opportunity. Every day, we shape personal growth, nurture curiosity, and foster relationships that prepare students to thrive in school and the world beyond it.
Degrees Held, Universities Attended: Bachelor of Arts, Oral Roberts University; Masters in Human Resources and Administration, Towson University
Joined EISD: 2022
Previous School Districts: Haddonfield School District, NJ; Montgomery Township School District, NJ; Baltimore City Public Schools, MD; New Haven Public Schools, CT

TRES ELLIS
I’m looking forward to another wonderful year as Assistant Principal at Hill Country Middle School, partnering with our exceptional staff to continue to cultivate a positive campus culture that reflects the Cougar values and vision of our leadership. This is my 34th year in education and 8th in administration. Prior to joining the staff here at HCMS I served as an Assistant Principal in Lake Travis ISD where I had the honor to open the new Bee Cave Middle School campus following one year at Lake Travis Middle School. Previously, I spent 10 years at Westlake High School as a Head Basketball Coach and AP Psychology/Teen Leadership teacher. My other experience in the Austin area, besides growing up here, includes being Head Basketball/Cross Country Coach and Psychology/Sociology teacher at Austin High. I began my career with seven years at New Braunfels Middle School as a teacher and coach, so it has been especially rewarding to return to working with students at such a formative age—when building strong character and sound decision-making skills is so important. Due to my continued love for coaching, I also serve as the Head Boys Basketball Coach at The Austin Waldorf School. My wife Laurie is also a teacher in Eanes ISD and has been a 4th-grade teacher at Forest Trail Elementary since 2002. We have two daughters, Megan (WHS ‘16 & Texas A&M ‘20) and Emily (WHS ‘20 & Texas A&M ‘24). When I'm not at school I enjoy running the trail at Town Lake and live music.
Degrees Held, Universities Attended: Bachelors of Science, Stephen F. Austin State University; Masters in Educational Leadership, University of Texas at Arlington
Previous School Districts: Lake Travis ISD, Austin ISD, Keller ISD, New Braunfels ISD

BRETT LA BISSONIERE
I am looking forward to another year of being an Assistant Principal at Hill Country Middle School. My teaching career began at West Ridge Middle School where I taught 7th grade science for 9 years. I am originally from the suburbs outside of Philadelphia and went to Penn State University, where I majored in Secondary Education with Biology and minored in Psychology. Throughout my teaching career at WRMS, I served as the science department head, the National Junior Honors Society co-sponsor, and a member of many committees. District-wide, I have served on the District Leadership Team, I was a member of the fifth cohort of the Institute for Excellence, and I was named the Eanes ISD District Educator of the Year for the 2020-2021 school year. In 2023, I earned my Master's Degree in Educational Leadership and Policy Studies from the University of Texas at Arlington and joined the HCMS leadership team that summer. Outside of school, I enjoy traveling and doing all outside activities with my husband and 8 month old son.
Degrees Held, Universities Attended: Bachelor of Science, Penn State University, Master of Education, University of Texas at Arlington
Joined EISD: 2014

BRAD CORBETT
My name is Brad Corbett and this is my first year as Assistant Principal at Hill Country Middle School. I come to HCMS with 20 years in education, 14 of which are here in Eanes ISD. I've taught in both general education and special education settings, from kindergarten all the way through 8th grade. In fact, I taught at HCMS 10 years ago. At the heart of all my work is the simple belief that relationships matter most. I believe that relationships are the foundation of everything we do here. Through strong relationships, students thrive, families feel connected, and staff feel valued.
Degrees Held, Universities Attended: Bachelor of Arts-Sociology, San Diego State University; Masters of Science-Special Education, Texas A&M University-Corpus Christi
Joined EISD: 2011
