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Mathnasium 915 Pearl Street, #D/E, San Diego CA 92037 (858) 291-8186

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It's always sunny in La Jolla!

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:


Anna A, Instructor

1.5+ Year Mathnasium Veteran

Anna graduated from UCSD in Spring of 2021. She previously worked at a Mathnasium in northern California before joining the team in La Jolla. She spends her free time adventuring as a guide for tourists throughout California's amazing outdoors, including National Park visits. 

Anna B, Instructor

Anna B is a student at UCSD. She enjoys all levels of math and is meticulous when it comes to math procedure and problem solving. 


Courtney, Instructor

1+ Year Mathnasium Veteran

Courtney is a student at San Diego State University and studying to become a math teacher. She instructs our students and is honing her curriculum management skills as well by monitoring student progress and growth. 


Dasuni, Instructor

2+ Year Mathnasium Veteran

Dasuni graduated with a Neurobiology major at UCSD. She plans to attend medical school and become an emergency room phyician because of its fast-paced environment. Dasuni loves to spend time with friends, go to the beach, and try all types of new foods. Dasuni is from Chicago and loves the San Diego weather!


Pooja, Instructor

Pooja is a senior at UCSD and looking to get into math education upon graduation next fall. She will be working in the great state of Hawaii! In the meantime, she enjoys working with students of all ages as they fill in gaps and learn to love math!


Apurwa, Instructor

Apurwa graduated from UCSD with a Bachelor degree in Cognative Science and a minor in Japanese language. She has lived in Nepal and Japan before relocating to the states. 

Meet Our Family Ownership Team

Karen Lossing is the center director/owner of the math learning center Mathnasium of 4S Ranch.

Karen Lossing, Executive Director

Karen earned a Bachelor’s degree in Marketing from Penn State and spent ten years in the business community. After staying at home with her kids, she earned her Texas Teaching certification and went on to teach third and fifth grades and Special Ed for seven years. In addition, she served on the Response to Intervention team and was the district liaison for Math Curriculum and Instruction. Karen completed her Master’s degree in 2010 and, prior to moving from Texas, served three years on her elementary school’s administration team incorporating and facilitating 21st Century learning standards.  

Karen has been a proud franchisee with Mathnasium since 2013 and looks forward to making math make sense to all the kids who learn at Mathnasium. Since opening her first location, Karen has been recognized by Mathnasium as a Top Performing Franchise Owner. Karen received the Exceptional People award in 2016 for her ability to hire and train one of the strongest instructional teams through Mathnasium. Karen has also been awarded in 2016, 2017, 2018, 2019 and 2020 for having Top Performing locations. 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.

Steve Lossing, Executive Director 

Steve is the proud co-owner of multiple Mathnasium Learning Centers in Southern California, Arizona and Texas. Steve retired in 2018 from Petco, where he served as the Chief Stores Officer. He also served as the Treasurer and a Board Member of the Petco Foundation, a leading supporter of animal welfare organizations nationally. He now works full-time with his wife, Karen, two children, Libby and Evan and their terrific Mathnasium teams.  

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!

Libby Lossing, Director of Operations

After serving as a seasonal Mathnasium Instructor since 2013, Libby graduated from UCLA in March 2017 and joined our team 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 operations. She has founded Teacher Appreciation Programs in San Diego, California and Phoenix, Arizona with local school districts and news teams. If you have any school events or sponsorship opportunities you would like Mathnasium to be involved in, Libby is your girl! Please feel free to send sponsorship information to and Libby will be in touch!

In addition to her role as Director of Operations, Libby also serves as our Regional Director in Arizona, overseeing the learning centers in the Phoenix area. She is proud to partner with our Center Directors and Instructional Teams to deliver the Mathnasium Method to students across the Valley of the Sun.


Evan Lossing, Director of Human Resources

Evan's professional experience with Mathnasium began in 2013 when his family opened their first math learning center. Evan spent many summers and holiday breaks working as an Instructor. After graduating his bachelors degree in Business Management at Texas Tech, he began working as the Director of Operations for our family enterprise and has now relocated back to his hometown in Collin County (Dallas, Texas)!

Evan is excited to work with our students and continue their progress with math. He, himself, struggled with math when he was in elementary school and with supplemental support was able to not only close my gaps but got into an accelerated math curriculum by the time he entered high school. 

Evan is a stickler for customer service and meeting and exceeding your expectations. He welcomes your recommendations. He looks forward to meeting you and sharing his passion for education with our mathletes.