New California Mathematics Standards

    Click here to see the powerpoint and how it will effect your students classes. 

    AP Summer Assignments

    Please visit our AP Info page for all AP summer assignments.  Click here to go there now.  

    Video Tutorials



    Meet Our Department

    Lead Teacher:  Mandi Sather

    Photo of Mandi Sather

    Mandi Sather received her Bachelor’s Degree from UC Riverside, her teaching credential from Cal State San Marcos, and earned her Master’s Degree in Education from Grand Canyon University. She has been a member of the Murrieta Mesa staff since 2011. 

    Lead Teacher: Jameson LeRossignol (Website)

    Jameson LeRossignol

    Jameson LeRossignol began his teaching career in Vista, California in 1997.  After he moved to Temecula with his wife and two daughters he took a job at nearby Murrieta Valley High School in 2002.  He taught at MVHS until the opportunity arrived to become a part of the opening of Murrieta Mesa High School.  Some of the courses he has taught over the past 19 years are Integrated I, Integrated II, Integrated III, CAHSEE Math, Algebra I, Algebra IB, Geometry, Algebra II, Advanced Algebra II, Precalculus, AP Statistics, and AP Calculus AB/BC.  He earned both a B.A. Degree in Mathematics-Computer Science and his Single Subject Math Teaching Credential from UCSD.  Jameson’s goal every year is to connect somehow with each of his students and to get them excited about the power of mathematics. Go Rams!  Oh yeah! 

    Robert Gergins    

    Rob Gergins 


    Donna Jarvie 

    Donna Jarvie
    Donna Jarvie received her Multiple Subject Teaching Credential in 2000.  She taught third grade for four years and fifth grade for another two years at a K-8 school in Fallbrook, California.  In those 6 years, she also taught pre-algebra and algebra to the junior high.  She has been teaching math for the last two years at Warm Springs Middle School and received her single subject math credential  in 2009. 


    David Halikis

    Dave Halikis


    Hyun Ko 

    Teddy Ko

    THORus Maximus (also known as Mr. Ko to his students) arrived on this planet to help human-kind. He has taught math for 11 years, six of them in this district. He has a passion for connecting with students and assisting them to achieve their true potential.  After graduating from UCLA, THORus wandered the earth, working in the international business field, studying theology, and contemplating the intricacies of the universe.  Realizing his potential to be a teacher, he received his Masters in Education and Single Subject Credential from Pepperdine University.  He has since taught Algebra 1, Geometry, Algebra 2, and has taught and coordinated the AVID program at Murrieta Valley High School.  His purpose on earth is to make sure all of his students receive incredibly awesome mathematics instruction.  THORus bless you!


    Monica Trillo

    Monica Trillo 

    Lesley Walker

    Mrs. Walker  

    Ian Pharris 






    Ricky Ray


    Ricky Ray

    Throughout my life, I have received several highlights and achievements that I am proud of. At the age of 15, I received the Eagle Scout award. After graduating high school, I was fortunate to have the opportunity to play college basketball at Cal State San Bernardino. From Cal State San Bernardino, I received my B.S. in Finance and immediately entered the professional workplace. Over the course of the next 8 years, I had several jobs that ranged from an Assistant Controller, Financial Analyst, and Database Consultant for several large companies. During this time, I learned a great deal as to how companies operate both financially and professionally. After 8 years, although, I knew something was missing in that while my professional career was self-motivating, I was really not helping anyone other than myself. This was the point in time that I decided that teaching would not only provide me with a nice career but would also allow me to help students. At this point, I got my credential and started working at Madrid Middle School in El Monte. After four wonderful years there, I started my tenure in the Murrieta Unified School District. Over the past 11 years in the Murrieta Unified School District, I have enjoyed working at Creekside High School, Tenaja Canyon Academy, and the Murrieta Adult School. During this time, I have had several achievements including obtaining my Master’s Degree in Business and receiving Teacher of the Year. But even though I have received several honors and achievements in my life, my greatest motivation and highlights have come from the many students that I have worked with in my teaching career. There is truly nothing more meaningful to me than working with students and having the opportunity to get to know them. I am truly grateful that I am a teacher. 




    Darrel Turner





    Priscilla Novello







    Charles Brown










Last Modified on October 6, 2020