Phone: (281) 327-3873


Degrees and Certifications:

Jennifer Petru, Principal

Hello, I am Jennifer Petru, and I have been dedicated to education and to Fort Bend ISD for 18 years in both middle and high school. My degrees are from Texas State (Eat Em’ up Cats!) and the University of Houston. I love spending time with my family and I have two amazing daughters.

I value the strong partnerships Thornton has with the community and parents to provide the best educational experience for the students. I am committed to the District's mission to inspire and equip students to pursue futures beyond what they can imagine. I believe in the importance of an engaging and supportive climate focused on student learning.  

Fort Bend ISD has the best and most diverse community in Texas! Thank you for allowing me the privilege of serving your families as the Principal of Thornton Middle School!

Thunder PRIDE never dies!

Phone: (281) 327-3958


Degrees and Certifications:

Dr. Shannon Williams, Associate Principal

Dr. Williams joins our staff with 24 years in education. A graduate of The University of Oklahoma in Mathematics Education, she earned her Masters in Educational Administration from the University of North Texas and Doctorate in Educational Leadership from Texas Southern University. Dr. Williams is a renaissance learner enjoying the opportunity to learn new topics of interest.    


Married to her college sweetheart Prosper Williams, Jr., they enjoy home projects, gardening and following the Prairie View ‘Marching Storm’ band program. Their son, Prosper Williams III, is a trombone player in the marching band, pep band and jazz band at Prairie View A&M.

Phone: (281) 327-3876


Degrees and Certifications:

Ms. Charlene Hefferin, 7th Grade Principal

Hi.  My name is Charlene Hefferin.  I am honored to join the Ronald Thornton Middle School family and look forward to a great school year.   I am committed to working in a partnership to nurture the social, emotional, and academic development of each of our students. 


This school year marks the beginning of my 18th year in education. I have six years of assistant principal experience along with experience as a campus math specialist, a math/science classroom teacher and math interventionist.  I earned my Masters in Educational Administration from Lamar University and my Bachelor’s from Maryville University of St. Louis.   


I am married with two stepsons and three lovable dachshunds; all who keep me very busy.  In the past two years, both of my stepsons have graduated from Dulles High School.  In my spare time, if you don't find me reading a book, you'll find me in the kitchen baking sweets or cooking new recipes for my family and friends.  


I can’t wait to meet all of the amazing teachers, families and students at RTMS!

Phone: 281-327-3908


Degrees and Certifications:

Mr. Patrick Watson, 8th Grade Principal

I am proud and grateful to be the Assistant Principal at Ronald Thornton Middle School. I am honored to embark upon my role and I look forward to assisting RTMS with all its great ideas and initiatives.


My role is to build relationships with all the Thundercat stakeholders and to help support our academic work. It is my philosophy that at the center of student achievement are the efforts of parents, teachers and students. My intention is to make sure that I can foster each of these as I support the mission of Fort Bend Independent School District. 


I have lived most of my life in Missouri City and have never wanted to leave this special area. My educational experiences have inspired me to be an educator. I graduated from Stephen F. Austin State University and accepted my first teaching position as a 6th grade teacher in Fort Bend. During my tenure I have served as a Physical Education, middle school science teacher, PALS and AVID teacher; Department Chair; and Master Science Teacher.  In 2018, I earned my master’s in educational administration from Texas Southern University. My decision to become an administrator came from a desire to make a positive impact on all students across the school.  


I’m eagerly anticipating working with the students, staff and parents and to take part in the phenomenal growth at Ronald Thornton Middle School. I look forward to getting this year off to a superb start!

Phone: (281) 327-3875


Degrees and Certifications:

Mr. Marcos Cardenas, 6th Grade Principal

I am very excited about the opportunity to serve Ronald Thornton Middle School as an Assistant Principal. The last three years at RTMS as a teacher and Technology Integration Champion has allowed me to build meaningful relationships with students, parents, and the amazing staff. I look forward to the opportunities ahead as we continue the mission and vision of RTMS and FBISD.