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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:

 Our Team serves the communites of Rancho San Diego, La Mesa, Spring Valley, El Cajon, Jamul, Lemon Grove, Grossmont, Fletcher Hills. and Granite Hills. Our center is located in Rancho San Diego Village (Smart & Final, Dixie Line, and 24 Hour Fitness) on Avocado Blvd. 



Brea Lee, Center Director 

Brea is the Center Director at Mathnasium of Rancho San Diego West. Brea graduated from Southwestern College with her AA in Computer Science and a BS in Web Design and Interactive Media from the Art Institute of California. She began tutoring in middle school by assisting her elementary teachers and it has been one of her passions ever since. She has an interest in all things 'nerdy' from programming and robotics to video games and fantasy novels. She also has a passion for music, and loves to attend concerts in her free time to support the local music scene.



 Andrew Quartuccio,  Lead Instructor

Andrew is attending Cuyamaca College with plans to transfer to a 4 year university and complete his Bachelors degree in Mathematics. He graduated from Valhalla High School in 2011. Andrew has been tutoring and helping his classmates with math since high school and is pursuing his goal of becoming  a college math professor. 

In his free time, Andrew enjoys reading about historical and modern science and math as well as stories of discoveries and experiments. He likes taking road trips, spending time with his family, and playing any sport with his friends when they're not working.




Casey Magnuson, Instructor

Casey earned her bachelor's degree in Applied Math from the University of California, Los Angeles.  After graduating UCLA she went to get her master's degree in Statistics from San Diego State University.  She currently teaches part time at San Diego Mesa College. 

Casey wanted to become a Center Director because she enjoys when students say that math makes sense. Casey has always liked tutoring but realized that she can impact more students by being apart of Mathnsium.

When she is not working, Casey loves to rock climb and go to the beach with her husband.

Kevin Magnuson, Instructor 

Kevin loves building confidence in all his students.  Kevin graduated with a degree in Philosophy from UCLA where he also extensively studied Economics and Mathematics.  His favorite class was game theory. When Kevin is not at Mathnasium, he is teaching beginning adults swim lessons or out exploring with his wife and their puppy.



Matthew Derango, Instructor 

Matthew is a college student who plans to transfer to UCSD and is pursing a degree in electrical engineering.   Math was not his favorite subject until he took his first calculus class, which led to a lifelong passion for math. He enjoys cycling and hiking.  In his free time, he enjoys studying new subjects in math and loves having new adventures in La Jolla Cove.  His spirit animal is a falcon.



 Matt O'Meara,  Instructor

Matt is currently pursuing a bachelor's degree in Mathematics with the intent to become a teacher.  Matt has a passion for helping kids and spends a measure of his free time volunteering as a youth leader at his church.  He also enjoys learning and is always interested in becoming acquainted with new and exciting hobbies. Additionally, Matt likes reading, writing, and seeking adventures with friends.  His favorite color is red, that's why he spends all his time at Mathnasium because it's red! 


Keir Sullivan,  Instructor

Keir is pursuing degrees in Philosophy and Physics.  Keir likes math because he enjoys the challenge, like putting together a puzzle. He loves Mathnasium because of the inclusive environment that maintains a healthy focus on mathematics.  In his free time he enjoys surfing, painting with watercolors, meeting new people, and listening to and discovering new music.