Administrative Staff

Mr. P. Grossweiler
Mr. Philip Grossweiler
Head of School/Principal
Mr. S. Cazares
Mr. Sam Cazares
Assistant Principal
Mrs. R. Nava
Mrs. Rocio Nava
Assistant Principal
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!
About Mr. Cazares
I have lived in McAllen for over 12 years. I am originally from Dallas, TX., however I have been in the RGV since 1989. I served in the U.S. Navy for five years before pursuing a BS in Biology and a Master of Education in Educational Administration, from UTPA.

I have been an educator for over 13 years. I worked at Mission High School before coming to Deleon MS. This is my first year at Deleon MS, and I am extremely excited to finally be serving my own community. 

McAllen ISD is one of the most innovative districts in the state and country. Our students, parents, staff and leadership make McAllen ISD the best place to work, without a doubt. I am privileged and honored to serve here.
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 compromise with our community to provide the best educational experience for all our students.