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Mathnasium 3451 Via Montebello, #190, Carlsbad CA 92009 (760) 452-6150

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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:

Jeremy Quizon, Center Director

3+ Year Mathnasium Veteran

Jeremy most recently served as Assistant Center Director of Mathnasium of 4S Ranch. Not only is her phenomenal at math, but he understands the many steps to get a student to progress.   but maintains and improves our high level of customer service, parent relations, and operational responsibilities. We are now proud to call him our Center Director.

Impressive Math Accomplishments:  5 on AP Calculus AB exam. Perfect 800 on SAT Math.

Why do you love Mathnasium?  Having fun with youngins and nerding out on math are two of my favorite things. At Mathnasium, I get to do things I love, and I'm even paid to do them!

Fun Fact:  I was originally a Mathnasium student back in my junior year of high school. I had a bad AP calculus teacher and needed extra help. After receiving a perfect score on my AP exam, Karen Lossing (the owner) offered to hire me as an instructor!



Jessica, Assistant Center Director

Jessica is currently a graduate student at San Diego State University where she plans to get a Master's degree in Biostatistics. She received her undergraduate degree in Neuroscience with a minor in Mathematics for University of San Diego. While at USD Jessica worked as an on-campus tutor and grader for the math department.

Fred, Instructor

5 Year Mathnasium Veteran

Fred is sharing a part of his retirement by dispensing his broad mathematical knowledge with our students. He is patient and thorough, making sure all steps are understood in the process. He works with our middle level math students in making prealgebra, algebra, and the prerequisite levels of math more easily understood.


Adrian, Instructor

Education: 4th Year at Palomar, receiving a Bachelor's Degree in Biology and Spanish

Impressive Math Accomplishments: A in Calculus 3

Why do you love Mathnasium?  I love the students who come in to improve their math skills. I also love how unique Mathnasium is and how students receive customized learning plans.  

Fun Fact: I am fluent in Spanish.

Adian plans to become a teacher because education has always been important to him. Adrian once struggled with math himself, as he rose through his coursework he gained success and began working with his peers so they reach their potential and build confidence. Adrian enjoys working at Mathnasium because he gets to help students of various math levels. 

Meet Our Ownership Team

Karen Lossing is the owner of Mathnasium of La Costa math tutoring center. Karen Lossing, Executive Director 

Karen has been a part of Mathnasium since 2013. She currently serves on the Mathnasium Franchise Advisory Committee, which helps guide Mathnasium Headquarters as it makes key decisions about the direction of the company. Often our center has the opportunity to pilot new curriculum or student management systems prior to global launches, allowing us to serve our students in the best way possible. 

Prior to joining Mathnasium, Karen taught 3rd, 5th and Special Ed, served on a Response to Intervention team and was a district liaison for Math Curriculum and Instruction. Karen completed her Master's degree in 2010 and served three years on her elementary school's administration team incorporating and facilitating 21st Century learning standards.  



Steven Lossing, Franchise Owner 

Steven is the proud co-owner of multiple Mathnasium locations in California and Arizona with his wife, Karen. Steve retired as the Chief Stores Officer at Petco, headquartered in San Diego, in Winter 2018 to focus full time on his Mathnasium locations. Steve remains on the Board of Directors for the Petco Foundation, serving as their Treasurer.

As a parent of two children who had divergent educational experiences, Steve appreciated Mathnasium's approach to prescribing a unique and customized curriculum for their learners. He saw the value the Mathnasium Learning Plan's could play in both struggling and excelling students. This makes the program perfect for students looking for tutoring in math, as well as those looking for enrichment.

Libby Lossing, Director of Operations

After serving as a seasonal instructor in our center since 2013, Libby graduated from UCLA and has joined onto our team full in in 2017 as the Director of Operations.

While she is no stranger to the instruction and tutoring aspects of our center, Libby focuses on the community involvement side of our center. So if you have any school events or sponsorship opportunities you would like Mathnasium of La Costa to be involved in, Libby is your girl!