Our staff is built to teach each student individually, to develop the skills they need to thrive in mathematics, and to foster a love of learning.

Mo Riad

Mo Riad is the owner of Mathnasium of Lake St. Louis. He has a 20 year career in institutional investment management in Washington DC, New York, and St Louis, focusing on quantitative finance. He earned a Bachelor of Science Degree in Finance from Wake Forest University and a Master's in Business Administration (MBA) from the Olin School of Business at Washington University in St. Louis. As a father of two children, Mo wanted to have a place that his kids felt that they could excel with their math skills. In order to fulfill this dream, Mo decided to open a Mathnasium so not only his children could benefit, but also the center could serve the rest of the community. Mo's favorite number is 10 because there are 10 fingers total on our hands. He also enjoys to barbeque during his free time.

Larry Martinek

Creator of the Mathnasium Method
Larry has spent his entire career finding a better way to teach math. From inner city to public schools, to acclaimed magnet schools, to leading private and parochial schools, Larry has served as both a classroom teacher and as an educational consultant. He has designed curriculum, teaching strategies, and teaching materials designed to help students and teachers learn math more effectively, He has trained teachers in the art and science of boosting students' ability to "do" math, thereby increasing students' math scores and feeling of self-worth. Larry is the developer of Mathnasium's educational program - one of the most comprehensive and innovative curricula ever produced for teaching math. While Larry is not an instructor at our center in Lake St. Louis, he is a valuable asset and we can call on him to ask specific student's scenarios for guidance and advice.

Stacey Blessing

Lead Instructor
Ms. Stacey Blessing spent the last 26 years as an elementary teacher. She attended Missouri Baptist University to receive a Bachelor's degree in Elementary Education. She then received a Masters degree in Elementary Math from University of Central Missouri. She has taught 4th and 5th grade for many years. She now works in the Francis Howell school district as a math interventionist K-5. In her free time, she loves to build and create with LEGOS!

Elishia Trieber

Lead Instructor
Ms. Elishia Trieber is from Idaho and studies organizational leadership at a college in Wentzville. When home in Idaho, she helps at a daycare and is involved with the youth and kids at her church. She enjoys spending time with loved ones, especially doing outdoor activities, such as going to the ocean, kayaking, and playing a sport. Elishia used to live on the Oregon coast, and she loved it there! Elishia’s favorite number is 9. She does not have a specific reason, other than it appears in her birthdate. She also likes 2, 19, and 29. (19 is also a part of her birthday, and one of her favorite football players wore the number 29).

Geoffrey Baker

Mr. Geoffrey Baker is a Senior at Francis Howell High School. He is currently enrolled in AP Calculus AB. He enjoys anything to do with math and science. His career goal would be something using both. Geoffrey loves game nights with his family and friends! Fun Fact: He is "uncle Geoffrey" to his 9 nieces and nephews, and Geoffrey is the youngest of 7. He grew up with one brother and five sisters! Geoffrey has always loved the number 13 because it was his older brother's favorite number and he wanted to be just like him. His favorite math joke is: Why do doctors always tell anyone who is cold to stand in a corner? Because they are always 90 degrees!

Rayna Classen

Ms. Rayna Classen is a student at St. Charles Community College and is studying Biochemistry. She hopes to pursue a career in scientific research. Rayna also enjoys making music, writing, and stargazing. One fun fact about Rayna is that she collects rocks! Her favorite number is 33 because it is the atomic number of her favorite element on the periodic table. Her favorite math joke is: What do math teachers and the Backstreet Boys have in common? They both want you to tell them y!

Matthew Nguyen

Mr. Matthew Nguyen is a Sophomore at Webster University. He is currently majoring in Finance. He enjoys learning about business operations and how they deal with their capital. He wants to work in the finance or accounting industry after he graduates. Matthew likes watching anime, playing tennis, and playing games with friends and family. Fun Fact: He enjoys making YouTube videos where he showcases fun time with friends during his free time. 100 is his favorite number because who doesn’t want to get a 100% on their test? His favorite math joke is: What do you get if you divide the circumference of a jack-o-lantern by its diameter? Pumpkin Pi.

Melissa Lopresti

Ms. Melissa Lopresti received her B.A. in both Mathematics and in Intelligence Studies. Her favorite number is 2 since it is the only even prime and number. She is an RPCV (Returned Peace Corps Volunteer) from Lesotho. Her weekends are spent geocaching, playing volleyball, and travelling.

Gunnika Singh

Ms. Gunnika Singh is a senior at Fort Zumwalt West High School, and she will be studying computer science or engineering next year. One day, she hopes to work with artificial intelligence! She absolutely loves math and actually grew up training mental math on an abacus. Gunnika is also obsessed with the Olympics and is now a figure skater herself! Aside from skating, Gunnika loves to read, journal, craft, and spend time with family and friends (including her lovable little sister). Her favorite number is 3 because the time, date, and month she was born in are all divisible by 3

Our Mathnasium Mission

Teach children math so they understand it, master it, and love it. Math can change their lives, and they can change the world.

What I love about Mathnasium is the ability to teach problem-solving skills and make math make sense, while also making a student smile.
Amber W., Mathnasium Instructor

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