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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:

 Dori Sousa, Center Director

With a Master's degree in Education from Nova Southestern University in Fort Lauderdale, Florida and over 30 years of teaching experience in public and private schools, Dori is committed to helping children reach their full potential. Mathnasium's ways teach strategies for life and positive results are reflected in all areas of the curriculum.  Dori believes that when given the proper instruction and opportunities, any student can succeed in math.




"A lot of people are afraid of studying mathematics in spite of their capacities.  My aim is to make people enjoy learning mathematics because mathematics is everywhere."

- Anonymous

William Ragsdale, Instructor 

William is a senior at KSU studying physics and mathematics hoping to eventually become a high school teacher with a dream of one day being a college professor. He loves science, math, gaming, and has love of seeing people improve their skills in any field. Fun fact about William is that his favorite number is 8,128 because it is the only “perfect number” between 1,000 and 10,000. He loves Mathnasium because “learning is my passion and seeing kids who believe they can’t, or have a hard time, end up excelling is an amazing thing.”

“The present is theirs; the future, for which I really worked, is mine.” -Nicola Tesla 


Joe Swartzendruber, Instructor

Joe is Computer Science Mayor, about a year from graduating.  He used to compete in math competitions in High School.

In five years, he hopes to be working a few years into his career.

Joe loves Mathnasium because he enjoys teaching the base of math for the students to build off.

Favorite number and why: 8, because it’s a sideways infinity.

                                                   My favorite Math Joke: “Infinity is a big number, I’m going to need more paper”

Nadine, Instructor

Nadine is a senior a River Ridge High School.  She is currently taking calculus and hope to attend UGA next year.   In her free time, she likes to read and volunteer.

In five years, she will be graduating and start working in getting her master’s degree in biomedical engineering.

Nadine loves Mathnasium because I like being the reason someone understands a subject they once believed was difficult.

Favorite number and why: 10, because I was born in 10/10

John, Instructor

John is a Freshman at Kennesaw State University and is pursuing a major in Computer Science. He enjoyed math since he was in elementary school where his father would teach him higher level math on the way to baseball practice.  He enjoys a variety of hobbies such as: skateboarding between classes, yo-yo’s, guitar, programming and of course math.

In five years, I will be: working towards my master’s degree in computer science while being an indie game developer on the side.

John loves Mathnasium because it gives him the opportunity to pass on my talents in math to younger kids in a friendly and fun environment.

Favorite number and why: 3, it uses to be my old Jersey number in baseball.  Same as Babe Ruth’s.

Favorite Math Joke: √-1 23 Ʃ π and it was delicious!


Jenna D, Instructor

Jenna is a junior at Etowah High School and part of Cherokee County's only Capstone Research program.  Her most recent math course is Honor Pre-Calculus.  She is a member of the cross country, swim and track Team, as well as being President of her class and Vice President of Etowah HOSA.

In five years, I will be: taking the MCAT and applying for medical school.

Jenna loves Mathnasium, because she loves being part of the reason someone learns to love Math.

Favorite number and why: 22, it is the date of her mom's, brother's and her birthday.

Favorite Math Joke: Why are obtuse angles so depressed? Because they’re never right.


Zac Mnich, Instructor

Zac is a freshman at Harvard University.  His current mayor is History with a minor in computer science, but he is looking to change computer science into his major.  Zac previously attended Etowah High School and Kennesaw State University as a dual enrollment student. 

In five years, he hopes to be pursuing a master’s Degree in computer science.

Zac loves Mathnasium, because he enjoys helping kids learn and understand new things.

Favorite number and why: 42, it’s the answer to life, the universe, and everything in it (It’s a book reference).

Favorite Math Joke: A farmer counted 196 cows in the field.  But when he rounded them up, he had a zoo.


Mackenzie Peed, Instructor

Mackenzie is a junior at Etowah High School and participated in their Mu-Alpha-Theta math club.  This year (2018) she will be moving into AP Calculus. In her free time, she loves to read and play volleyball. 

Mackenzie loves Mathnasium because it gives kids a one on one experience to better understand and she gets to help them achieve this.

Favorite number and why: 20, because in elementary school we were given a number by last name and I was 20.

Favorite Math Joke: What do you get if you divide the circumference of a jack-o-lantern by its diameter? Pumpkin Pie!