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 fourth year at Reagan High School and my 25th year teaching!  I am very much looking forward to a another great year at REAGAN HIGH SCHOOL!  We accept the challenges given to us and will be ready to overcome them!

 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, tennis and track during my career.   In addition to sports, I love being outdoors, movies, reading and spending time with family and friends!   

 To join my Google Classroom, please email me at and I will send you the code.

Here's to a great Rattler Year!





  • 1st Period- ON LEVEL US HISTORY

    2nd Period- AP US HISTORY

    3rd Period- ON LEVEL US HISTORY

    4th Period- AP US HISTORY

    5th Period- AP US HISTORY

    6th Period- AP US HISTORY

    7th Period- CONFERENCE


    M, Tu, Th, Fr  9-10 AM

    M- F   3:45-4:30