Our staff is built to teach each student individually, to develop the skills they need to thrive in mathematics, and to foster a love of learning.

Youngkun Weiss

Director of Operations

Youngkun's journey in education began with his pursuit of a bachelor’s degree in Pure Mathematics at Revelle College, University of California San Diego (UCSD). However, his passion soon shifted towards math education, prompting him to change his major to focus on secondary education. Since 2013, Youngkun has been actively involved in tutoring and various educational initiatives, demonstrating his commitment to education both within and beyond academia. 

In January 2015, Youngkun became an instructor at Mathnasium, driven by a desire to make a direct impact on students' mathematical experiences. His dedication and leadership abilities quickly became evident, and by late 2017, he had transitioned to the role of Center Director. His continued success led to his promotion to Director of Operations in early 2023, where he now oversees multiple Mathnasium centers, including those in San Diego, Phoenix, Denver, Dallas, and Cincinnati. 

Youngkun firmly believes that every student deserves to approach math with confidence. He is a staunch advocate of the Mathnasium method, which emphasizes a deep understanding of mathematical concepts and aims to eliminate the fear of math that often impedes student progress.  

Committed to fostering the personal and professional growth of both instructors and students within his region, Youngkun strives to create an environment where learning math is a positive and empowering experience.

Karen Lossing

Executive Director

Karen is a powerhouse in the world of education, with a mission to make math click for every child. Karen’s career in education began in 2004 when she noticed her son was falling behind academically and wanted to help him and students like him get the best support available. Karen earned her master’s and teaching certificate and became a classroom teacher. During her years of teaching, she worked as an interventionist and district liaison for math curriculum and instruction. 

After nearly a decade working in schools, Karen shifted gears to supplemental education in 2013 and opened the doors to her first Mathnasium franchise. Karen's first learning center has been recognized as a top performing location for several years in a row. 

In addition to the work she does at her learning centers, Karen has served on the Mathnasium Franchise Advisory Committee, where her influence has been instrumental in shaping the company's direction and curriculum. Her efforts have led to the frequent adoption of new curriculum and student management systems, ensuring Mathnasium offers the best possible tools to help students excel and instilling confidence in her leadership.   

Some of Karen’s achievements include:

  • Franchise Business Rockstar: Karen was nominated by Mathnasium headquarters as the top performing family-owned business representing our brand and was selected by the Franchise Business Review to receive the Franchise Business Rockstar award in 2023. 
  • Artichoke Award: The Artichoke Award is a prestigious internal accolade created by Mathnasium’s founder, Larry, and is dedicated to one franchisee at the franchise’s annual convention. The artichoke represents that at the core of the franchisee’s business is their heart surrounded by layers of excellence, a perfect metaphor for Karen's contributions. 
  • Exceptional People Award: Karen was recognized for building a team of exceptional educators that drove great results for Mathnasium students.

Today, Karen and her family own a network of Mathnasium Learning Centers, empowering K-12 students to unlock their full math potential.

Evan Lossing

Director of Human Resources

Evan's journey at Mathnasium began in 2013 as an Instructor. His passion for math education stemmed from his own academic journey. In elementary school, Evan overcame challenges in math with supplemental support, ultimately excelling and earning a spot in the accelerated program by high school. Fueled by a desire to help others experience similar success, Evan pursued a bachelor's degree in business management at Texas Tech University. Upon graduating, he leveraged his education and Mathnasium experience to excel as our Director of Human Resources.

Evan is relentlessly committed to providing exceptional customer experiences. His passion for understanding and meeting the needs of our students and their families drives him to continually seek out new knowledge and strategies. From staying on top of industry trends to immersing himself in educational podcasts and webinars, Evan is always on the forefront of customer service best practices. His dedication to creating positive and lasting relationships with our students and their families is evident in everything he does. 

Evan recognizes that happy employees who are thoroughly trained and fully engaged with the work they’re doing produce the best results. Evan hosts weekly trainings and has built continued education programs to empower our team to continue to best themselves. His work was recognized by our headquarters and he was invited to help build national training programs to benefit our entire franchise network. 

Some of Evan’s achievements include:

  • Top Workplaces: The Mathnasium team was anonymously surveyed by a third party company, Energage, and the results earned us the coveted gold badge for workplace satisfaction. Mathnasium was recognized as a top ranked workplace in local publications. 
  • Best Tutoring / Learning Center: Evan’s Mathnasium learning centers were recognized by local families as the best resource for tutoring in Living Magazine’s reader’s choice awards. 
  • World’s Best Dad: According to his wife and two little kids, Oaklee and Everett.

Chloe Neargarder

Mathnasium@home Director

Have a Mathnasium@home question? 

Check out this resource page: https://www.mathnasium.com/math-centers/parker/news/mathnasiumhome-resources-faq-answers

Steven Lossing

Executive Director

Steve is the proud co-owner of multiple Mathnasium Learning Centers with his wife, Karen, and their two children, Libby and Evan. Steve believes Mathnasium not only builds students' math skills, but also helps build their self-confidence. The Mathnasium method of teaching students math, the unique and customized curriculum for each student and the passionate team of instructors ensures that every student succeeds, whether they are catching up, keeping up or getting ahead!. 

Prior to franchising with Mathnasium, Steve served as the Chief Stores Officer of Petco and volunteered as the Treasurer and Board Member of the Petco Foundation, a leading supporter of animal welfare organizations nationally.

Libby Kuker

Director of Marketing

Libby brings a dynamic blend of leadership, education, and community spirit to her roles as Director of Marketing at Mathnasium.

Prior to joining the Mathnasium team full time, Libby attended the University of California, Los Angeles, where she was the Captain of the UCLA Spirit Squad and traveled the country as the school’s mascot. This multifaceted experience allows her to connect with a wide range of people and fosters a collaborative and engaging atmosphere in her work. In addition to her bachelor's degree from UCLA, Libby holds a certificate in School Management and Leadership from the prestigious Harvard School of Education and Business School.

Some of Libby’s exceptional achievements include:

  • Best Overall Marketing in North America: Libby was recognized as the first ever recipient of this award because of her outstanding community and school engagement, media integrations with local news, and overall ambassadorship for the brand.
  • Best Assessment Improvement Award: In a franchise of over 1,000 learning centers, Libby’s location showed the best educational results for students overall.
  • Local Business Person of the Year: An award voted on by local business owners based on the value of the person’s contributions to their network.

A key member of the Mathnasium team since 2017, Libby is dedicated to creating a positive and enriching learning environment for all students.

Darren

Instructor

I grew up in Parker and still love living in Colorado! Mathnasium is the perfect fit for me because it combines my passion for math with helping others. I enjoy making math more approachable and helping students build confidence in their skills.

Outside of Mathnasium, I love playing and watching sports, spending time outdoors, and playing board games with family and friends. My favorite number is 24 because of its many factors, and a fun fact about me—I used to race cars as a kid! In five years, I see myself working as an engineer and using my math skills every day.

Jaydeen

Instructor

About me:  I am a student at Regis Jesuit High School where I love hanging out with my friends, playing varsity soccer, and participating with our mock trial program! In my free time, I enjoy reading and watching movies which often inspires my writing and portrait drawing. While my evenings are usually spent at club soccer practices, I try to make time for playing the piano, running trails, archery, and baking sweets for my family! I’m hoping to continue playing soccer in college too!

Why I love working at Mathnasium:  I love working at Mathnasium because I get to help students build their confidence in math and witness their “aha” moments! It is such a rewarding experience as the kids find their passion for problem solving and build upon the lessons which they can use in their everyday lives.

Favorite number  My favorite number is 99 because of a children’s show my sister and I used to watch that we really enjoyed and bonded over.

Fun fact about myself  I have a husky named Echo who I love taking on early morning runs and hikes!

In 5 years I’ll be….  I’m not entirely sure where I’ll be in five years, but I plan on going to college out of state and following a pre-law track!



Lisa

Instructor

Teaching has always been my passion. I spent years in the Cherry Creek School District teaching third and fifth grade and was honored as Teacher of the Year at my school. After retiring, I missed working with kids, which led me to Mathnasium—where I love helping students grow and build confidence in math.

I hold bachelor’s and master’s degrees in business administration and a master’s in elementary education. Outside of Mathnasium, I enjoy scrapbooking, cooking, and spending time with my family, including my two dogs, Lucy and Lola, and my grandchildren, Elijah and Thomas.

Irika

Instructor

About me:  I'm a student at Mountain Vista, and I hope to be a cardiologist one day! My favorite pastimes include reading, going on runs, and spending time with my neighbors. At school, I'm a part of my school's HOSA and TSA chapters and spend a lot of time playing basketball.

Why I love working at Mathnasium:  I love working at Mathnasium because of the supportive community! It shaped my love for math when I was a student, and it's exciting to get to play a role in building kids' confidence.

Favorite number:  My favorite number is 15, it's my jersey number!

Fun fact about myself:  I've never ordered any flavor besides chocolate at an ice cream shop.

 In 5 years I’ll be….In 5 years, I plan to be in a pre-med college program studying to be a doctor!



Mary

Instructor

 About me  I am a certified mathematics educator with experience in secondary classrooms. I started working at Mathnasium during the summer of 2022. I love cooking, baking, listening to music, creating art, dancing, watching movies, driving, spending time with family and friends, escape rooms, eating yummy foods, and going to concerts, baseball games, and hockey games!


 Why I love working at Mathnasium... I love working at Mathnasium because of the fun environment! I love making connections with students and celebrating their successes!


 Favorite number  My favorite number is 2520, because it's the smallest number that is divisible by all digits, 1 - 10!


 Fun fact about myself I collect Nutcrackers, holiday ornaments, and fridge magnets.


 In 5 years I'll be.... In 5 years, I hope to still be inspiring young people to be and become their best.


 What our students say they like about Mary  "Mary is a really cool instructor who helps me stay on task." "My favorite thing about Mary is that she is so kind and always makes me feel happy!" 

Max

Instructor

About me:  I have lived in Colorado all my life, and love camping, hiking, and doing anything outdoors. I am in high school and participate in the Men's Varsity Volleyball team, as well as play club volleyball year round. I also have played Baseball and Basketball when I was younger. I am taking classes aimed towards engineering as that is what I hope to do in my future career.


Why I love working at Mathnasium: I love working at Mathnasium because I get to help kids learn math in a simpler way, which will benefit them throughout the rest of their life.

Favorite number:  My favorite number is 20, because it is the day I was born on, and the number I put on my sports jerseys.

Fun fact about myself: I have 5 siblings, 4 of which are either in college or married.

In 5 years I’ll be…. In 5 years I plan to be attending college studying some kind of engineering, most likely aerospace.


Alex

Instructor

About me:  I have lived in Parker Colorado my whole life and love going up to the mountains. In my free time I like to go golfing, fishing, or anything out in nature. My favorite time of the year is fall because it is perfect for golfing and fishing, and I love seeing the fall leaves up in the mountains.      

Why I love working at Mathnasium: I have always enjoyed math, and finding ways for other people to enjoy it makes me happy.

Favorite number:  My favorite number is 34 because it has always felt lucky for me. Also, I found out that 34 is the sum of the digits in my birthday!

Fun fact about myself:  I have never left the country or been on an airplane.     

In 5 years I’ll be….  In 5 years I will either be at college, studying aviation, or in the air force academy to be a pilot.       


Pranav

Instructor

About me:  Hi! My name is Pranav and I am a student at Legend High School. I like to wrestle and also I participate in clubs such as HOSA and TSA at my school. My hobbies include working out and playing video games.

Why I love working at Mathnasium: It’s a great environment and I love teaching math.

Favorite number:  My favorite number is 5 because I feel lucky about it.

Fun fact about myself:  I placed at TSA multiple times at state!

In 5 years I’ll be….  I will be probably pursuing a degree in microbiology or wrestling in college.



Raditya

Instructor

About me:  Hi! My name is Raditya (my friends call me Deech) and I'm a student at Chesterton Academy of Our Lady of Victory in Englewood. Math has always been my favorite subject in school, but outside of that, some of my hobbies are piano, Tae Kwon Do, and I love watching football whenever I have time. 

Why I love working at Mathnasium:  I love seeing that there are always many ways to get to the same answer. For me, it's always been so satisfying to get the same result by different methods. My math teacher in 5th grade, Mrs. Davis, really inspired me to love and appreciate math, and I hope I can do the share that same inspiration to everyone at Mathnasium! 

Favorite number:  If I had to choose, my favorite number would be e, also known as Euler's number. Like π, this is an irrational number that goes on forever. Euler's number is roughly 2.71828... It is important in many practical fields, including bacteria growth rate, radioactive decay, and compounding interest on money, among many, many other things. And so, Euler's number is one of the most beautiful numbers there is.  

Fun fact about myself:  I can pop both of my thumbs at will, and this always freaks my friends out. 

In 5 years I'll be... I hope to go to college, where I'm currently considering double majoring in piano performance as well as engineering and math.  

Our Mathnasium Mission

Teach children math so they understand it, master it, and love it. Math can change their lives, and they can change the world.

Quote Quote
What I love about Mathnasium is the ability to teach problem-solving skills and make math make sense, while also making a student smile.
Amber W., Mathnasium Instructor

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Student using math cubes to solve fractions
Student working with a math tutor at a local math learning center

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