• Meet the Teachers


    Jisu Chanthaphonh: My name is Mrs. Chanthaphonh, and this is my eighteenth year teaching Mathematics. I am originally from Seoul, South Korea. I currently live in Cumming with my husband, two kids who are 6th and 9th graders, and a dog named Stella. I graduated from GSU and KSU with a Master's Degree in Math Education. I am also a certified Gifted Math Teacher. As a Sixth/Seventh Grade teacher, it is gratifying to watch students experience more responsibility and more freedom as they transition from a static, elementary school, learning environment. I have extremely high expectations for all my students and find they always rise to meet (and sometimes exceed) those expectations. I know that it will be an amazing year!E-mail: chanthaphonh@fultonschools.org

    Courtney Cox: Hello! I am Courtney Cox and I am excited to be your student's math teacher this year! I am certified in special education, middle grades mathematics and TAG. This is my 14th year teaching at River Trail, and I absolutely love it! I have been teaching math at River Trail for over 10 years. I have taught 6th, 7th and 8th grade math and have loved being a part of the 7th grade team for the past 4 years. When I am not at RTMS, I love spending time with my family and friends and chasing around my four-year old son, Bennett and almost one year old son, Cooper. I look forward to a great school year!E-mail: coxc2@fultonschools.org

    Kelly Tetreault: I have been teaching at River Trail Middle School for 20 years. I have a bachelor’s degree in middle grades education with a concentration in math and language arts from the University of North Georgia. I have taught sixth-grade, seventh-grade, and eighth-grade math at RTMS. I am the math department chair, and I have been at RTMS since it opened in 2001. I have a wonderful husband, and a child in elementary, middle, and high school this year. I enjoy tennis, kayaking, and spending time with my family and friends.E-mail: tetreault@fultonschools.org

    Jacinth Warner: “The essence of mathematics is not to make simple things complicated, but to make complicated things simple.” ~ S. Gudder 9 + 17 = 26 Where have the years gone? I have enjoyed 9 amazing years as an elementary teacher and 17 incredible years as a middle school math teacher. My name is Jacinth K. Warner and I will be your child’s 7th-grade math teacher. I am a mother of three who enjoys hosting events and cooking. My three kids are products of River Trail Middle School and Northview High School. We moved to Johns Creek in 2004 after living in Fayetteville, North Carolina for 7 years. I look forward to your continued support as I prepare your child for 8th-grade math and beyond! 😊 E-mail: warnerjk@fultonschools.org