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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:

 Sean Dolan, Co-owner and Center Director

Sean is a math enthusiast from way back. In high school, he attended the Georgia Governor's Honors program in math, won the National Beta Club award for Mathematics, and then went on to major on Mathematics at the College of William and Mary in Virginia, where he met his eventual business partner Cameron Nimmo. Since then, he's spent most of his career in software development for telecommunications technology companies, with occasional stints as a part-time math instructor at Chatahoochee Tech. Now, he is excited to begin a new kind of career with his first love, mathematics, and really looks forward to sharing with kids how much beauty and fun there is in learning math.

Cameron Nimmo, Co-owner and Center Director

Cam is the son of a math teacher, but he did not immediately follow in his father's footsteps.  At the College of William and Mary, where he and Sean first met, Cam studied languages. He is fluent in several languages. The early part of his professional life was spent in the financial industry, but after few years, he got involved in education.  This led to over twenty years of teaching and then running his own school.  And now, his involvement in Mathnasium pleases his father to no end.

David Stephens

David was excited to accept long time friend Sean’s invitation to join Mathnasium in August. He is a retired high school math teacher and has enjoyed working with students for many years. After leaving full time teaching when working a full daytime job in healthcare, he was hired to teach a college algebra course at night for Gwinnett Technical College. 

His aptitude for mathematics instruction was supported by several outstanding teachers in elementary and high school. He was in a class of twelve students as a Senior to take calculus which had never been offered prior to that class at his school. He holds a Masters in Math from Georgia State University.

When not at Mathnasium, he stays busy working in community theatre and church music as a performer and as a music director. He also enjoys time spent with his twin toddler granddaughters.

He is challenged by the students at Mathnasium and encouraged to find new ways to explain concepts that lead them to a better understanding of math.

Jacob Michelis

Jacob is majoring in Mathematics at Kennesaw State University.He has worked as a private tutor for math and science since high school. He is originally from Gainesville, Florida, but moved to Milton 12 years ago. In his spare time he enjoys hiking and programming. 

To quote Jacob: "The Mathnasium method is great. The curriculum is solid and customized to each student's needs, and the students receive a great mix of independent work and individual help."


Tony Elengickal

Tony is currently a senior at Alpharetta High School, planning on going to college as a Biochemistry major next year. He originally started at Mathnasium as a tenth grader, and has been working for over a year now. Originally from Pennsylvania, Tony lives with his parents and older brother in Alpharetta. In his free time, he likes spending time with his friends, playing Ultimate Frisbee, and playing his saxophone.


Katie Fishman

Katie is currently a senior at Cambridge High School. She is applying to college right now, and I am excited to see where she will end up next year. She plans to major in finance or engineering. In addition to working at Mathnasium, she is a swim coach and lifeguard at White Columns Country Club. She has loved to help swimmers improve their strokes and grow closer bonds. She is an active member of the Mu Alpha Theta (math honor society) chapter at Cambridge. She helps to tutor underclassmen in geometry and pre-calculus. 

Katie was born in London, England. She has lived in both Ohio and now Georgia.

Her hobbies include swimming and running cross country. She is a member in beta and french club too. She also enjoy helping out with my school's special education program. 

Both her parents are Canadian. She has an older brother at Georgia Tech and an older sister at Georgia College.

To quote Katie: "I fully support the mathnasium method because it allows students to have both the independent and assisted learning experiences they need to be successful. It allows students to work on specific areas of studies to better help them in the classroom."

 Zach Corcoran

Zach is a senior at Cambridge high school. Next year, he plans to major in chemical engineering. He was born in Newburyport, Massachusetts, and currently living in Milton, Georgia. Throughout high school, he has regularly tutored other students through the Math National Honors Society and Science National Honors Society. In addition to being a great math instructor, Zach also enjoys wake boarding, fishing, and tennis.

To quote Zach: "I feel that the Mathnasium Method is fantastic in intuitively teaching the fundamentals of mathematics as well as filling gaps missed in traditional education. The Method builds on itself, allowing for the reinforcement of past concepts during the teaching of new ones."


Center DirectorGiulio Helmsdorff, Consultant and Mentor

Since Giulio was a kid, he enjoyed building and taking apart anything he could get his hands on. Math and physics became more than a subject in school, but a way to understand the world around him. He graduated as a Mechanical Engineer in 1993 and worked for nine years in the manufacturing industry designing tools and parts for cars. He earned an MBA degree in 2003 from Babson College in Massachusetts and worked in two technology startups before finding Mathnasium.

Giulio has always enjoyed teaching. Before any important math test in high school there were always three or four classmates looking to him for help. As early as his first year in college, Giulio was teaching math and physics or working as a teaching assistant.

Giulio is fluent in Italian and Spanish, and is a trusted mentor to both Sean and Cam.

"In good and bad times the best gift parents can give their children is mind and soul for their journey. Mathnasium is the best gift for a child's mind. A little Mathnasium soul also comes along."

Rosalie Hopkins, Assistant Center Director


Rosalie Hopkins is a veteran educator, having taught middle school, high school, and university students in three states. After teaching in public institutions of learning for more than 10 years, she founded a company dedicated to training adult learners. Rosalie received her bachelor’s and master’s degrees from the University of Delaware, and her doctorate in Education from the University of Georgia.

“Here in Georgia, through Hope scholarships, our children are fortunate to have almost free access to many first-rate colleges. universities, and institutes of higher education. Helping children understand and use math from an early age is the best way to ensure that they will be able to take full advantage of this tremendous resource.”

Of the Mathnasium program she says, “If the United States is to remain competitive in the global economy, we will surely need a workforce that is mathematically proficient. Helping youngsters ‘flex their math muscles’ from elementary school on provides the foundation for learning and the confidence to tackle advanced mathematical concepts.”


Assistant Center DirectorNina Bernardi, Consultant and Mentor


Nina has a Bachelor and Master Degree in Fine Arts.

As a member of the Mathnasium team, she uses her longtime experience to advise and mentor Sean and Cam and helps maintain the operational excellence of the Learning Center. She also brings an invaluable approach to teaching math for students who feel more comfortable of expressive and creative tasks (a “right side of the brain” preponderance). Nina has reached the highest certification in the Mathnasium Method.

Of the Mathnasium program she says, “It is important to realize that some students are much better at creative and expressive tasks and an instructor needs to play to those strengths to teach logical and analytic thinking”