Mathnasium 17581 Glasgow Ave, Lakeville MN 55044 (763) 269-6969   Member Service: (612) 454-0582

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We are OPEN for both In-Center and Online instruction. Call today 763-269-6969!

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:

Ken Johnson, Center Director



Ken earned college degrees in Biology, Chemistry, Math and Physics. He spent the early years of his career teaching college chemistry and working as chemistry lab technician for government and university research labs and also as a physicist at 3M in St. Paul. When he reached his upper 30’s he chose to work for a church where some of his responsibilities involved managing programs for children. After 27 years in this position, Ken recently retired and decided to combine his interest in math with his interest in helping children succeed in life – which brought him to Mathnasium.

Owner...........Master Certified Instructor

Bobby Tarnowski, Owner


It thrills me to see a young person's face light up when it finally hits them how math works and is useful in the things they're passionate about. I believe that a solid understanding of mathematics is foundational in our ability to make good life choices, equipping us to live lives with greater independence and accomplishment of our goals. I graduated from St. John's University with a B.A. in Mathematics and continued with a Master's Program in Manufacturing Systems Engineering at the University of St. Thomas. Math has been indispensible throughout my career in engineering and management, and is also quite useful in my business and family life.

Lead Instructor

Steve Johnson, Lead Instructor



Steve Graduated from St. Olaf College with a degree in mathematics. He taught high school math for 11 years in Minnesota and Wisconsin schools. During that time he was introduced to his first desktop plug-in calculator, resulting in him throwing out his slide rule. Steve then worked for 25 years with Sperry, a high tech company that later changed to Lockheed Martin through company mergers, as a software engineer and later as a project manager. There he learned to count in different number bases including octal and hexadecimal. Steve loves working with kids and nurtures that love by substitute teaching, asking his 3 grandchildren mental math questions, and playing in a church youth band. He is excited to be a member of the Mathnasium staff and to apply innovative methods to help students learn math. 

Tom Joseph, Instructor


Tom is a retired educator after serving 43 years as an elementary/middle school teacher and principal.  Tom received his BA and MA from the University of Wisconsin.  Since his retirement, Tom has tutored math to middle school and high school students at several inner-city schools.  Strongly embracing the Mathnasium Method, Tom loves the way the program greatly increases the confindence level of students and supercharges their ability to think "mathsensically."  Tom enjoys his seven grandchildren, reading, working out, kayaking and traveling.  


Jeanne Olson, Instructor



Jeanne is a State of Minnesota licensed middle school teacher for Mathematics.  She attended Gustavus Adolphus and the University of Minnesota earning a BS from the College of Education.   She has shown her versatility by working in a variety of settings:  public and private, inner city and suburban, regular and substitute teacher.  She currently is a substitute teacher and very excited to be part of the Mathnasium experience.  Jeanne loves to help students learn.  Once you meet Jeanne her enthusiasm for math will catch on with you too!!!

Terri Joseph, Instructor


Terri recently retired after teaching middle school math for 31 years.  She received a BS in math from the University of Wisconsin Green Bay and an MA from the University of St Thomas.  She is grateful to be able to continue to work with young people in the Mathnasium setting.  She enjoys hanging out with her seven grandchildren, reading and traveling.


   David Andre, Instructor

David has more than 37 years of experience using Math Concepts in business and education environments. 

His education includes a BA in Management and Computer Science; In Process is a BA in Mathematics at the University of Minnesota and an MBA from Warwick School, London England.  He was employed as a Teacher’s Assistant for Teachers on Call and was assigned to many different high, middle, and grade schools including students with autism and other learning disabilities.  He is a former hockey and tennis player who enjoys coaching kids in the USTA Tennis league.  

"My teaching method for helping students young and old is designed to help those that have a fear of or anxiety with the subject of Mathematics.  From my own experience, mathematics was difficult until I was introduced to my seventh-grade math teacher.  In summary, he made mathematics fun and it was from that humble beginning that led to my love of learning and teaching Mathematics."

"Our goal in teaching and helping your child understand Mathematics is to reinforce the current lessons from your school by providing the student with the concept, followed by important vocabulary, complemented with methods, and demonstrated with examples for your child to refer to.  In summary, Mathematics is about pattern development."  


  Anson Tiong, Instructor

Anson Tiong is a first-year EECS (Electrical Engineering and Computer Science) major at the University of California, Berkeley. He is the newest member of the Lakeville Mathnasium team. Anson is fond of math, and finds it fun to discover new ways to solve a math problem. Anson won 1st place in the individual overall in the Canterbury Division of the Minnesota High School Math League in his junior and senior years. With the latest win, he became the Lakeville South High School all-time career leading scorer. Before joining Mathnasium, Anson tutored math and science to students of various grade levels and backgrounds. It is his goal to help students improve their problem-solving skills over time. In his spare time, Anson enjoys playing piano, composing music, and creating stop-motion animations.


  Anna Carow, Instructor

  Anna Carow is a first year Computer Engineering major attending the Georgia Institute of Technology. She began working at Mathnasium in her junior year of high school, and now returns to work during school breaks. At Georgia Tech, Anna is a member of the Solar Racing team, where she helps build a solar powered car to race across the country in annual competitions. In her free time, Anna enjoys exploring Atlanta and spending time at her family’s cabin. By working at Mathnasium, Anna hopes to make kids fall in love with math just as much as she has.