Contact Us for a Free Consultation

How did you hear about us?

Our Team

Our specially trained math instructors will teach your child how to understand math in an individual setting; our unique approach enables us to explain concepts really well and lend a helping hand to every student. Our tutors foster a caring, encouraging environment that helps kids thrive and learn! Read below to learn more about our talented team:

Amber Beckemeyer, Director

Amber has been with Mathnasium since August 2014, starting out as an instructor and working her way up. Before that, she spent several years in education after completing a Bachelor's in Math & Psychology, as well as a Master's in Teaching. While she always envisioned herself teaching inside a typical classroom, Amber was pleasantly surprised at how much Mathnasium felt like home. Amber feels as if she has finally found her place in this world and she works incredibly hard to make it a welcoming environment for all.


Celia Croy, Lead Instructor

Celia holds a Bachelor’s degree in Biology from UC San Diego, and studied Music Composition at American River College. She currently teaches piano and guitar lessons to children and enjoys playing the piano and other percussion instruments in American River College’s performing ensembles. Celia has always had a love for math and and has found joy in tutoring math students of all ages.



Lyuba Vasilenko, Lead Instructor

Lyuba graduated from Sacramento State University with a BA in Mathematics. One of her biggest goals in life has always been to work with teens and kids in some way and Mathnasium has given her a great environment to do that. She also currently serves in multiple ministries at her church, including finance, music, and teen ministry. She strives to learn and grow in this job and all her ministries so that some day she can teach math in her own high school classroom.


Mark Nelson, Instructor

As a young child, Mark developed an aptitude and love of math and science, but it was not until attending high school that he really got a sense of how they both fit together. Going on to American River College, he began taking calculus, chemistry and physics, and thought hard about becoming an engineer. However, after taking a break while serving as a missionary for two years, he returned to school and realized that it was the math he felt most drawn to. 


Jarek Marcinek, Instructor


Andrew Schubauer, Instructor

Andrew graduated from Mira Loma High School in 2017 and is currently studying Computer Science and pursuing an AA in Language Studies at American River College. He has tutored and taught students for many years in a variety of subjects, including mathematics. It is his desire to help others flourish in all levels of mathematics.



Shahin Sams, Instructor

Shahin graduated with high honors from UC Davis with a degree in Biomedical Engineering and will return to Davis to pursue her PhD in the same field. Math was always her favorite subject in school and wants to help kids understand it from an early age so they can enjoy and better appreciate everything math touches in our everyday lives – like music, cooking, art, and science! When not in the lab or tutoring, she loves going on hikes, painting, writing and illustrating children’s books, playing guitar, and writing music.


Ljiljana Morris, Instructor

Ljiljana graduated from UCLA with MSc in Space Physics. She has been teaching math, physics and science at universities and colleges throughout the Los Angeles area for many years before moving to Sacramento in 2016. She loves teaching math because it helps students developing critical thinking and problem solving skills, the two necessary ingredients to succeed in school and life. In her free time, she enjoys choir singing and outdoor activities.

Ryan Fekete, Instructor

Ryan has always thought of math as his favorite subject in school which led him to pursue and complete a BS in Chemical Engineering at UC Riverside. Being able to pass on his gained knowledge to others has always been a big motivator for him and he loves being able to do just that in such a wonderful environment. When not teaching math he enjoys both exploring the outdoors on hikes and playing video games.


Justin Ramirez, Instructor


Raneem Alshaikh Saeed, Instructor

Raneem graduated from Sacramento State University with a BA in Pure Mathematics. She is a bilingual math/science tutor fluent in Arabic and English. Raneem has ten years of experience tutoring Math/ Science at American River College. Also, she has two years of experience tutoring Math at Sacramento State University. Raneem’s favorite pastimes include visiting new restaurants and traveling. Raneem likes to see student’s success in school and hopes one day to pursue her Masters in Math.