Administrative Staff

Administrative Staff
Philip Grossweiler
Mr. Philip Grossweiler
Head of School 
Principal's Message
Welcome to our Alonzo De Leon Middle School school website! 
We're proud and honored to have the opportunity to educate your children.
Your satisfaction is important to us, so let us know how we're doing.
I wish all of you a very safe and successful school year!
O Snelling
Ms. Olga Snelling
Assistant Principal
About Ms. Snelling
Education is my passion.  The passion has been to create an environment for meaningful learning that fosters students to become life-long learners focused on making dreams come true.  I have had the pleasure of teaching only prime number grades, but have been an administrator in elementary, middle school and high school levels.  I join the DeLeon Lion Pride to effectively utilize the learning community to improve and empower teacher and student learning as we continue to grow in our academic and emotional intelligence.
C Saenz 
Ms. Corina Saenz
Assistant Principal
About Ms. Saenz

Corina Saenz began her career in education as a teacher in 2004.  With seven years experience in the classroom teacher she pursued to advance her education and position and in the summer of 2013 she became an administrator with McAllen ISD.  She is currently the Assistant Principal for 6th and 8th grade.

Mrs. Saenz holds a Bachelor’s degree in Kinesiology from the University of Pan American and a Master’s in administration leadership from Grand Canyon University.  She holds certification for Principal in Arizona and Texas.

J Kingston

Mr. John Kingston

Testing Coordinator

About Mr. Kingston

Jon Kingston began teaching in 1995 as a band director.  He taught fifteen of the last twenty-four years here in McAllen ISD.  He served as the Texas Music Educators Association Region 15 webmaster and audition tabulator from 1996 to 2017.  In the spring of 2017 he went into administration as the Campus Testing Coordinator at Cathey Middle School and now served in the same capacity at De Leon Middle School.


Mr. Kingston holds a Bachelor of Arts degree in Instrumental Music Education from Central College in Pella, Iowa and a Master of Education in Administration degree from Lamar University in Beaumont, Texas. He also holds a Texas Principal certificate.

 R NavaMs. Rocio Nava

IB Coordinator

About Ms. Nava
My name is Rocio Nava and I have been in education for 12 years.  I taught middle school math and Algebra 1 for 8 years. 
I was an instructional coach for 4 years at De Leon MS and 1 year at McAllen ISD.  I am proud to be a member of our McAllen ISD family.  I have a promise with our community to provide the best educational experience for all our students.