Phone: 970-348-5102


Degrees and Certifications:

Mr. Sean Miller

Classes Taught


Algebra I

Algebra II



AP Calculus AB

AP Calculus BC


Room 207


I grew up in a small town called Frederick. I earned my undergraduate degree in secondary education at the University of Northern Colorado in which my focus was mathematics. In the fall of 2014, I finished my masters in mathematics as well as education at the University of Northern Colorado and the University of Wyoming. In my research project, I enumerated the number of subgroups fo the dihedral group D(n) Research Paper . In my spare time, I enjoy spending time with my wife (the amazing Mrs. Jordan Miller) and our baby boy Finley. I am the head softball coach and assistant girls basketball coach at Greeley Central. In 2015 I was awarded the GCHS assistant coach of the year (for softball) and in 2018 the CHSAA assistant coach of the month (gilrs basketball).  I enjoy spending time with my family as well as fishing and hiking. I previously worked at Thornton Middle School before landing here in the castle. I love being a part of the mathematics department at GCHS. This will be my tenth year teaching in the castle. 


My ultimate goal in life is to help others reach their potential as well as to be the best father and husband to my family. 


What did 0 say to 8...Nice Belt! 


  • Congrats to Sean Miller of Greeley Central's Girls Basketball program! He is reconized as the assistant coach of the month for November, presented by !

    CHSAA Coach of the Month

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