Mathnasium 600 Hartbrook Drive, Hartland WI 53029 (262) 287-0937

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Give your child an edge this school year with Mathnasium and schedule a risk-free assessment for your child today!

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:


CenterDirectorDerek Pipkorn, Owner

Hi! I'm Derek,  the Owner of Mathnasium of Lake Country. I also own Mathnasium centers in Brookfield, Mequon, 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, dad to Lucy, and dog owner of Willie (corgi), I love staying active in the community and enjoying all that the Greater Milwaukee area has to offer. 

Kayla Sommer, Center Director

Hello! I'm Kayla, the Center Director of Mathnasium of Lake Country. I have a great passion for education and learning! I received my bachelor's degree in Elementary Education from the University of Wisconsin-Madison. Go Badgers! I was previously a 7th and 8th grade math teacher in Milwaukee and I am currently working on earning my Master's of Educational Leadership from Cardinal Stritch University. I have also served as a private math tutor for elementary aged students. I am excited to use my education background in this role at Mathnasium of Lake Country and provide math support to students while building their confidence! In my free time, I enjoy traveling, biking, and hiking. I am looking forward to getting to know all of our Lake Country families and continuing to support students in their mathematics growth!

Brian Hoffman, Assistant Center Director

Hi there! I'm Brian, the Assistant Center Director of Mathnasium of Lake Country. A little about me, I received my bachelor's degree in Educational Studies from Carroll University. Roll Pios! While at Carroll University I played soccer and lacrosse. I'm excited to share my love for education and business in this role! In my free time I love playing golf, fishing, and traveling, especially to Disney World! I can't wait to bring my passion for education and love for math to the Mathnasium of Lake Country!

Jenna Hribar, Instructor

Hi! My name is Jenna Hribar, and I'm in my senior year at Oconomowoc High School! I have completed math through AP Calculus BC, which includes grade-level math, Algebra 1, Geometry, Algebra 2, and Precalculus. Over the years, I have volunteered at Vacation Bible School at my church and in the kids' room during services, so I have experience working with kids. I love to see their creativity and unique approaches to problem-solving. Additionally, playing soccer, and being a captain, has taught me how to encourage others to do their best and respect different ways for different kids to improve. I am excited to learn more approaches to solving math problems, as well as solving any other problems that may arise. Outside of school, I enjoy running, spending time at the lake, playing with my new puppy, and reading. At school, I am involved in forensics, National Honor Society, and National Business Honors Society, and have leadership roles in the National Social Studies Honor society and Model UN. I think my leadership positions have taught me how to help others help themselves, and I will translate that into this job. I hope to see you at Mathnasium! 

Will Bay, Instructor

Hello, I'm Will. I recently graduated from the University of Chicago with degrees in mathematics and physics. I am considering going to graduate school, but in the meantime I am applying my interest in teaching math by working at Mathnasium. I have five younger siblings, and have had the opportunity to help them, and some of my classmates, with math over the years. I have long been interested in math, and I took AP Calculus AB, AP Calculus BC, and AP Statistics in high school, as well as Calculus 3. I appreciate being able to help people understand new concepts, and I look forward to continuing to do so at Mathnasium! In my free time I enjoy reading, especially about history, and playing strategy board games. 

Aine Thomas, Instructor

Hi! My name is Aine and I am a junior at Arrowhead High School. I am currently taking Calculus I, and once I graduate, I hope to study data science and applied mathematics in college. Ever since I was a little girl, I've loved to learn, and math has been one of my best subjects. I've gained a lot of tutoring experience, first with my friends in elementary school, and later with my younger brother and fellow students at my school. Even outside of a math environment, I love spending time with kids, in particular my younger cousins and neighbors. I love helping kids learn and grow, and it is so rewarding to see their excitement when they get that "click" of understanding. In my free time, I enjoy playing saxophone, reading, skiing, and participating in forensics and debate. I'm so excited to be a part of the Mathnasium team, and I look forward to working with you!

Megan Leonard, Instructor

Hi! My name is Megan and I am a senior studying Neurobiology and Psychology at UW-Madison. I plan to go to graduate school to become a physical therapist and work in pediatrics. I love working with children, and I have a lot of experience with them whether it’s from spending time with my many little cousins, babysitting/nannying for numerous families, or volunteer tutoring. Math was one of my favorite subjects growing up, and I was placed on an accelerated track at an early age which led to my completion of Calculus II in high school. Additionally, my mom is an elementary school teacher, so over the years I’ve gotten to help in the classroom with her students. Through that experience, I learned that I love helping children develop mastery of concepts which is so important for future success in school, so working as a Mathnasium tutor seemed like a perfect fit! In my free time I enjoy playing piano, running, hiking, golfing, and traveling. I'm so excited to be a part of the Mathnasium team, and I look forward to working with you!



We are looking for Math All-Star's to join our Lake Country team! 

Mathnasium of Lake Country is looking for individuals who are exceptional at math and love teaching kids. We love math and are looking for enthusiastic instructors to help kids understand math like never before! To inquire about instructor positions at this learning center, please complete the Instructor Job Application link below.

Hours can be flexible (10 - 20 hours/week)! We are currently hiring for those available during the school year.

Are you ready to work in a fun, flexible, math-only learning environment? Complete the application.



Other Mathnasium Opportunities!

Mathnasium of Lake Country is locally owned by a math educator, Derek Pipkorn. We own multiple centers in the Milwaukee area and are always looking to grow. If you would like to discuss a potential Assistant Center Director or Center Director position at any of our centers, please reach out to Derek at