Seguin   INDEPENDENT SCHOOL DISTRICT   exceptional students to exceptional citizens

General Information
AJ Briesemeister Middle School
1616 W. Court 
Seguin, TX 78155
Phone: 830-401-8711
Fax: 830-379-0615

School Hours
School begins at 8:10 a.m.
School dismisses at 3:40 p.m.

Amber Gonzales


Exceptional students learning, growing, and becoming global citizens together.


Collaborating with all the AJB stakeholders to empower students to excellence. 

A.J. Briesemeister Middle School opened its doors to students in 1973. Since that time, the school has gone through several renovations and has now entered the new millennium of education.


Alvin J. Briesemeister, affectionately known to those around him as "Mr.Briese," served the school children of Seguin for most of his adult life. He was first a teacher and coach, then a principal of the high school, assistant superintendent, and finally, superintendent of Seguin schools for 16 years. Briesemeister was born October 28, 1896, in Ottine, a son of the late Julius and Martha Louise Briesemeister. He received his teaching certification from Southwest Texas State College in 1915, his B.A. from that school in 1925, and his M.A. from the University of Texas at Austin in 1937. He served as a history teacher and coach in 1926 in Seguin public schools, and in 1941, he was named high school principal. In 1943, he was named principal and assistant superintendent, taking over the duties as superintendent in 1949.


Mr. Briesemeister was active in numerous professional organizations as well as many church and community affairs."Mr. Briese" announced his retirement to be effective July 1, 1965, but a tragic and untimely automobile accident on June 10, 1965, claimed his life and that of his wife.

Bell Schedule 2018-2019

Supply List 


Amber Gonzales, Principal


This is my sixteenth year in education.  Prior to joining Seguin I.S.D. as principal of A.J. Briesemeister in October 2017, I was a Principal for Northside ISD in San Antonio.


I received my Bachelor of Arts degree in Interdisciplinary Studies from The University of Texas at San Antonio.  I also received my Master of Arts degree in Education in the area of Reading Specialist as well as Certification for Administration from The University of Texas at San Antonio .


I have lived all over the world.  I was born on the island of Cyprus in Nicosia.  I have also lived in India, Brazil, Ecuador and Japan.  Stateside, I have lived in Virginia and Texas.  I have been asked many times where I call home; I say “Texas”.    My husband and I have three grown children.  We are learning how to enjoy the time having grown children affords us.


In my spare time I enjoy going to the movies and reading.  I am very excited about being a part of the Seguin I.S.D. family and I look forward to another great year.




Kristal Mata, Academic Dean


My name is Kristal Mata Falcon, I am currently in my 6th year at AJ Briesemeister Middle School.  For my first five years I served as an Assistant Principal.  This coming year I am excited about my new role as Academic Dean. 


I originally graduated from Texas State University in 2008 with a Bachelor’s Degree in Liberal Arts. I taught English Language Arts at Seguin High School for four years. I pursued my Master’s Degree in Educational Administration and graduated from Lamar University in 2012.


I am very happy to be working at AJB- the place to be- and I feel very blessed to be able to work with such wonderful educators and students.




Michele Castillo, Assistant Principal


I am honored to be a part of the A.J. Briesemeister Middle School family as an Assistant Principal. This will be my fourteenth year in education. I spent the last thirteen years in Hays CISD as a 5th Grade Classroom Teacher, Interventionist, Instructional Coach and the Assessment and Accountability Specialist.

I received my Bachelor of Arts in Government from The University of Texas at Austin, my Masters of Education from Texas State University and my Principal Certification from Stephen F. Austin University.

My husband and I have three children ages 18, 12 and 10. In my spare time I enjoy fishing, swimming, watching UT football and relaxing with my family.

I am thrilled to be here at AJB and look forward to the amazing things that will happen here this school year.




Dale Gonzales, Assistant Principal


I am proud to be a part of the A.J. Briesemeister Middle School family and Toro Nation. I began my educational career at Haas Middle School in Corpus Christi, Texas. I spent four years at Pearsall Junior High in Pearsall, Texas. Throughout my educational career I have served as a Tutor, Teacher, Athletic Coach, Athletic Coordinator, Instructional Coach, and now Assistant Principal.

I was raised in South Texas and graduated from Pearsall High School. I then went on to earn a Bachelors of Science in Interdisciplinary Studies from Texas A&M University at College Station and my Masters of Educational Leadership and Policy Studies from the University of Texas at Arlington.

Outside of work, my biggest interest has become fitness. I enjoy all types of athletic training including weightlifting, light jogs, swimming, cardio, plyo, and basketball, just to name a few. In addition, as a former coach and musician, I have a passion for supporting athletic and fine art events and programs.

I am excited for a great year at AJB Middle School, and I look forward to serving our great Seguin Community!