Mathnasium 6780 Roswell Rd, Suite D-100A, Sandy Springs GA 30328 (404) 334-3300

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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:


Celso Torres, Center Director

Celso graduated with a B.S. in Systems Engineering with a minor in Computer Science from Washington University in St. Louis. He lived in Washington D.C. for a year and a half working as a Data Analyst for Johns Hopkins before moving back home to Atlanta.

Celso enjoys listening to music, reading, and thinking in his free time. He often finds himself observing and learning about the connection between various educational disciplines, particularly with regard to philosophy, sociology, anthropology, psychology, and physiology. 

Favorite Number: "It's not really a number but I really like the concept of base 10. It makes calculations so much easier and is a very intuitive way for us to understand orders of magnitude."

Favorite Math Joke: "How do you keep cold in a warm room? You go to a corner because it's always 90 degrees!"

Fun Fact: "When I was younger I was obsessed with soccer and I would play with the ball for hours. I got pretty good at a couple tricks....might favorite being the classic 'around the world'!"

"I love Mathnasium because it's a fun environment where complicated math topics are broken down into friendly, easy-to-understand pieces. The process of helping a student see and understand math concepts is very rewarding!"


Dr. Frank Cao, Owner

Frank received his PhD in Biological Sciences from University of Buffalo in 1997. He moved to Atlanta in 1999 and worked at Emory University as a Post-Doc for a number of years, before joining CDC as a Research Fellow working on infectious diseases. As a scientist, Frank has worked on many different projects and has published over a dozen peer-reviewed research papers.

Strong mathematical skills have always benefited Frank in his research, as well as other parts of his life. Ever since learned about Mathnasium, and discovered how great it's been changing kids' lives and preparing them for their future success, Frank has decided to become an owner. He is thrilled to be the new owner of Mathnasium Sandy Springs since Oct. 1, 2019, and is looking forward to contributing greatly to the success of this Center.

Favorite Number: "7, because I was born on the 7th, and I wore #7 jersey for both my high school and college soccer teams."

Favorite Math Joke: "What is the volume of a pizza with a radius of Z and thickness of A? Pi-Z-Z-A"

Fun Fact: "My first ever gift was a Rubik's Cube from my brother! I loved it so much that I developed my own algorithm to solve it as a teenager."

"I Love Mathnasium because I love math, and I love to be around kids!" 


Lexi Brendel, Assistant Center Director


 Lexi has a great love for helping kids reach their full potential in school and beyond! She earned her BFA from Kennesaw State University with Honors and is almost done with her MA with a focus on education. When she isn't working with kids to find a new love of math, Lexi loves to watch Star Wars! 

Favorite Number: 6 because that is my birthday and lucky number!

Favorite Math Joke: Are any monsters good at Mathematics? No, unless you Count Dracula

Fun Fact: My favorite color is pink. Bonus points if there's glitter!

"I love seeing kids thrive and learn to enjoy a subject that may have previously scared them."


Jovany Louis, Lead Instructor

Jovani is a Haitian-American recent graduate from Georgia State University, currently enrolled at Georgia Tech. He is a mathematics tutor looking to help other students in need. He's been tutoring all types of students for over 6 years. After doing undergraduate research in the Mathematics and Physics department with RIMMES and with the Casa-Sloan foundation, he realized that mathematical research and teaching was his passion. He plans to obtain a Ph.D. in Mathematics and Physics. In doing this, he hopes one day to become a university professor who can do research, teach, and inspire others to learn and not be afraid of STEM. In his spare time, he enjoys watching sports, watching TV shows/movies, playing the piano, and spending time with his family

Favorite Number: "I don't have a favorite number, but I do have a group of numbers. Prime numbers are my favorite group of numbers. Prime numbers are the building blocks of numbers. I love them for how important, beautiful, and mysterious they are."

Favorite Math Joke: "How do you make seven even? You remove the 's'!"

Fun Fact: "I'm a church musician. I play piano for various churches."

"I love Mathnasium because a lot of students struggle with mathematics because they are missing mathematical understanding from previous years. Here at Mathnasium, there is a fantastic curriculum great for tackling those gaps in understanding that may be present in students. The mental math approach is great because it not only helps students understand math at its root, but it helps improve students' problem-solving and critical thinking skills."

Sheri S., Instructor

Sheri studied Political Science and Information Systems while in college. After graduating, he worked in IT for a number of years and has always been a secret "fan" of Math. Sheri is the kind of person who enjoys puzzles, mental challenges, and explaining numbers and technology concepts to people and did so in various volunteer roles. Sheri also wanted to work part-time for a while and Mathnasium was and is a great fit.

Favorite Number: "2000 because Y2K was supposed to crash all the computers in the world, but in reality, nothing really happened! (We were lucky)."

Favorite Math Joke: "Three statisticians are practicing their archery skills by firing arrows at a target. One shoots and misses two feet to the left. The second shoots and misses two feet to the right. The third one jumps up and says 'Yay – We got it!'"

Fun Fact: "I like to go to restaurants and figure out the ingredients in new dishes so I can cooking them at home!.

"I love Mathnasium because it’s a relaxed work environment and working with kids is really rewarding! We learn so much from each other!"


Christian C., Instructor

Christian has a Master's of Architecture from Andrews University. He is currently pursuing a Civil Engineering degree at Kennesaw State University. He has worked as an architecture camp counselor at Andrews University and has done peer tutoring as well. He has also worked with stage design for different productions at Andrews.

Favorite Number: "Graham's Number (the largest number calculated) because it is a huge number!"

Favorite Math Joke: "What did the counselor say to Trig's parents about his obsession with the difference between sines and cosines?" "Don't worry, it's just a phase"

Fun Fact: "I have hiked up Machu Picchu"

"I love Mathnasium because I really enjoy seeing the moment that students finally 'get it!"



Gavin Brown, Instructor

Gavin is a junior at North Springs High School. He is enrolled and an active member of the math and science magnet program and National Honors Society. Gavin loves knowing and teaching the why in math to fully understand concepts. He is currently taking and thriving in AP Calculus at school.

Favorite Number: "4 and 8 are my 2nd and 3rd favorite numbers, so I put them next to each other to get my favorite, 48!"

Favorite Math Joke: "What did the area say to the perimeter? I'm trying to talk, but I feel like you're just going around my problem"

Fun Fact: "I love music and just a few months ago, I finally picked up the electric guitar."

"I love Mathnasium because I see students become increasingly independent and mature. They also strive in goal setting and accomplishing tasks."


Joshua Sampson, Instructor

Joshua is a senior at the Weber School in Sandy Springs. He scored a 780 on his Math SAT and has been nominated for the national honors society. In addition to loving math, he has a love for the violin! He is also heavily involved with the Jewish/Israeli community.

Favorite Number: "7 (any 2-digit number with 7 in it as the last digit) because it is a clean odd and prime number."

Favorite Math Joke: "What is 1+2? 4 because 1,2,3,4!!!"

Fun Fact: "I was raised for 8 years in Thailand."

"I love Mathnasium because it creates a very positive environment for both instructors and students and Mathnasium really does make learning math fun and engaging."

Carnell Lyon, @ Home Instructor

Carnell is currently a student at the Georgia Institute of Technology majoring in Aerospace Engineering with minors in Math and Physics. When he was in high school, he tutored students in Math, Reading, and Writing at the Tutoring Center in his hometown of Powder Springs, Georgia. He graduated from high school top of his class. In his free time, he loves playing video games and reading comics. 

Favorite Number: "My favorite number is the Planck length as it is the smallest possible length allowed by current day physics."

Favorite Math Joke: "What did the triangle say to the circle?.... You're Pointless!"

Fun Fact: "I lived in England for 6 years!"

"I love Mathnasium because it is a place where students can overcome all their difficulties in math"