J. Rogers
We adopted my daughter at 10, and her past foster homes hadn't always schooled her regularly so she really nee...
See more reviews here




J. Rogers
We adopted my daughter at 10, and her past foster homes hadn't always schooled her regularly so she really nee...
See more reviews hereOur Results
94%
Math Skills
of parents report an improvement in their child’s math skills and understanding.
93%
Attitude
of parents report improved attitude toward math after attending Mathnasium.
90%
Success
of students saw an improvement in their school grades.
Our Results
The Proof Is In The Numbers
Math Skills
of parents report an improvement in their child’s math skills and understanding.
Attitude
of parents report improved attitude toward math after attending Mathnasium.
Success
of students saw an improvement in their school grades.
Mathnasium’s specially trained tutors in Oconomowoc use the Mathnasium Method™, our proprietary teaching approach that combines personalized learning plans with proven teaching techniques to develop solid foundations for math mastery.
We build upon what the student already knows, addressing their unique learning needs and increasing knowledge level by level.
Our caring, specially trained math tutors provide face-to-face instruction in a supportive and engaging learning environment. We work with students of all skill levels, both in-center and online, to help them achieve math mastery.
Watch the video to discover how Mathnasium tutors helped Malachi become more confident in math.
Each Mathnasium student receives a personalized learning plan that considers their current skill level, knowledge gaps, and academic goals. Combined with our teaching approach, the plan is designed to help the student truly understand, master, and enjoy math.
Discover how Mathnasium helped Maddie transform her math skills. Initially struggling with the lowest math grades in her class, Maddie worked with our tutors using a personalized approach tailored to her specific needs.
Math Tutors Near You
We specialize in math-only instruction with a focused, caring, and fun learning approach that delivers results. We proudly serve the communities and schools in Oconomowoc, including:
Specially Trained and Caring Team
Jenna Riesterer
Center Director
My name is Jenna Riesterer, and I’m so excited to step into the role of Center Director at Mathnasium of Oconomowoc! I’m originally from Menomonee Falls and graduated from UW–Madison with a degree in Marketing and a minor in International Business. My studies gave me a strong foundation in math and analytics and a real appreciation for how math shows up in everyday life.
When I’m not at Mathnasium, you’ll probably find me reading, running (I’m currently training for the Lakefront Half Marathon), checking out a concert or musical, or traveling. An all-time favorite trip of mine was a semester abroad in Milan, Italy, a time I still love talking about whenever I get the chance.
I’m truly excited to get to know all of you and your amazing families. It’s an honor to be part of a team that helps students grow in confidence and thrive in math!
Teddy Legler
Assistant Center Director
Hello, my name is Teddy Legler and I am thrilled to be the Assistant Center Director for the Oconomowoc and Hartland Mathnasium centers! I was born and raised in St. Louis, Missouri but my grandparents lived in Wisconsin so I’ve been around Madison and Milwaukee a bunch over the years (and I’ve been a Packers fan my whole life). I graduated from Truman State University with a degree in Mathematics and a minor in Studio Art. In my free time I enjoy reading, playing volleyball, hanging out with my cat, and listening to music. I love math and am super excited to help students understand and enjoy it as much as I do!
Derek Pipkorn
Owner
Hi! I'm Derek, the Owner of Mathnasium of Oconomowoc. I also own Mathnasium centers in Brookfield, Hartland, Mequon, Waukesha, and Wauwatosa - yes, I love Mathnasium! Prior to becoming a Mathnasium owner, I worked as a Middle School Math Specialist in the Mequon-Thiensville School District. I previously taught elementary and middle school students in Milwaukee Public Schools and the West Allis-West Milwaukee School District. I have a Masters of Educational Leadership from Cardinal Stritch University and a Bachelors in Middle Childhood - Early Adolescence Education with math emphasis from the University of Wisconsin-Milwaukee. I've been actively involved in math organizations at the State and National level. I was previously the chair of the Classroom Resources Committee for the National Council of Teachers of Mathematics and recently finished a term on the Board of Directors for the Wisconsin Math Council. I have taught and tutored children of all ages, and I am committed to bringing the Mathnasium Method to the children in our community. Married to Jillian and dad to Lucy & Ellie, I love staying active in the community and enjoying all that the Greater Milwaukee area has to offer.
Jillian Pipkorn
Director of Marketing
Hello! I'm Jillian, the Director of Marketing and Community Outreach for six Mathnasium locations in the greater Milwaukee area that my husband, Derek, and I own -- Brookfield, Hartland, Mequon, Oconomowoc, Waukesha, and Wauwatosa. I am thrilled to be a part of our growing Mathnasium team and love the impact that we are making in children's lives and our local communities. I enjoy making connections in the community with schools, kid-centric organizations, and other small businesses. (Let's connect if you fall into one of these groups!) I am a graduate of Indiana University with a degree in Marketing, and prior to joining Mathnasium spent 12 years developing Marketing Strategy at Kohl's. I also have years of experience event planning and fundraising for Susan G. Komen as a volunteer in the fight against breast cancer. When I'm not working on all things Mathnasium, I enjoy spending time with my two daughters Lucy & Ellie, being active, trying new recipes from my cookbook collection, and attending musicals.
Angie Cramer
Managing Director
Hello! I'm Angie, Managing Director for the six Mathnasium locations in the greater Milwaukee area, owned by the Pipkorns. I hold Bachelor’s degrees in Elementary and Special Education from the University of Missouri and a Masters in Educational Leadership from Christian Brothers University. Prior to joining the Mathnasium team, I was a classroom teacher, school principal, district leader, executive coach, mentor, and professional development leader. I love working with our Center Directors and supporting the incredible work happening across this network of Mathnasium centers! When not at work, you can find my husband Steve and I on the ice at the Milwaukee Curling Club, or in the stands cheering on the Bucks, Brewers, Packers, Badgers, or Admirals with our sons Tom and Ben.
Ali Gilbertson
Director of Operations
Mathnasium has been a part of my journey since 2011, when I first became an instructor in high school. Nearly a decade later, I was thrilled to rejoin the company as a Center Director, and now, as Director of Operations, I have the privilege of working with each of our centers to ensure every student has an incredible learning experience.
With over four years on this amazing team, I’m deeply passionate about helping students build confidence in their math skills and discover the fun in math. What I love most about Mathnasium is the relationships we build—watching students grow, succeed, and develop a love for learning is the most rewarding part of what we do!
Our Instruction Staff
Math Instructors (Tutors)
From early childhood through high school, Oconomowoc's math programs are designed to support students at every stage of their math journey.
We introduce preschool and kindergarten learners to foundational math concepts through hands-on, playful instruction that builds number sense while fostering curiosity and confidence from the very start.
For students in grades 1–5, we focus on developing a solid understanding of concepts like addition, subtraction, multiplication, division, fractions, and decimals, making math clear and enjoyable.
We help middle schoolers navigate classes like Prealgebra and Geometry by breaking down abstract ideas into manageable steps in a supportive environment where understanding and confidence grow.
High school students receive targeted support for Algebra, Trigonometry, Precalculus, and standardized math test prep that positions them for academic success and future college admissions opportunities.
Students can take 3 easy steps to enroll at Mathnasium.
All students begin their Mathnasium journey with a diagnostic assessment that pinpoints what they already know and what they still need to learn.
FAQ
Save $100 and start the year building math confidence with a 7+ or 12+ month membership.
Schedule Free Assessment
Try Mathnasium of risk-free with our 30-Day Satisfaction Guarantee.
Contact Us
Has Mathnasium made a positive impact in your child's life? Want to shout it from the rooftops? L...
Contact Us
The best way to see if we are a good fit for your child’s needs is to visit our center, meet the ...
Schedule Free Assessment
When more than one of your children enroll at Mathnasium, we waive additional enrollment fees and...
Contact UsKnowledge Hub
Jan 22, 2026
Jan 22, 2026
Jan 22, 2026
Jan 14, 2026
Jan 9, 2026
Jan 5, 2026
Dec 15, 2025
Dec 5, 2025
Dec 3, 2025
Nov 10, 2025
1456 Olympia Fields Drive
Oconomowoc, WI 53066
| Call: | (262) 599-5815 |
| Email: | [email protected] |
Mon
3:00PM - 7:00PM
Tue
3:00PM - 7:00PM
Wed
3:00PM - 7:00PM
Thu
2:30PM - 7:00PM
Fri
10:00AM - 2:00PM
Mon
3:00PM - 7:00PM
Tue
3:00PM - 7:00PM
Wed
3:00PM - 7:00PM
Thu
2:30PM - 7:00PM
Sat
10:00AM - 2:00PM
| Mon: | 3:00PM - 7:00PM |
| Tue: | 3:00PM - 7:00PM |
| Wed: | 3:00PM - 7:00PM |
| Thu: | 2:30PM - 7:00PM |
| Fri: | 10:00AM - 2:00PM |
| Mon: | 3:00PM - 7:00PM |
| Tue: | 3:00PM - 7:00PM |
| Wed: | 3:00PM - 7:00PM |
| Thu: | 2:30PM - 7:00PM |
| Sat: | 10:00AM - 2:00PM |