Phone: 210-356-1800


Degrees and Certifications:

Social Studies Composite 6-12 Masters in Educational Leadership, Lamar University Bachelor's in Social Studies Education UT Austin Bachelor's in Advertising Management UT Austin College Board AP US HISTORY Reader 6 years.

Mr. Robert Casselberry

 This will be my 7th year at Reagan High School and my 28th year teaching!  I am very much looking forward to a another great year at REAGAN HIGH SCHOOL! 

 I grew up in Houston and I am a proud graduate of THE University of Texas at Austin.  I have degrees in Advertising Management and Secondary Social Studies Education.  I have a Masters Degree in Education Leadership from Lamar University.

  In addition to teaching, I have coached basketball, football, baseball, softball, tennis and track during my career.   I LOVE music, being outdoors, movies, reading, traveling and spending time with family and friends!   

Here's to a great Rattler Year!

Mr. C





  • 1st Period-  Conference

    2nd Period- US History

    3rd Period-  US History

    4th Period-  Lunch

    5th Period-  US History

    6th Period-  US History

    7th Period-  AP US History

    8th Period-  AP US History


    M, Tu, W,  Fri  8-8:40am

    After School By Appointment