Mathnasium 1073 El Camino Real, #100, Redwood City CA 94063 (650) 486-0606

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Our physical center is now OPEN! Enrolled families, please check your email for details or contact us with any questions!

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:

Christina Sellers, Center Director 

Christina was born and raised in the Bay Area and graduated from Arizona State  University with a BA in Anthropology. She later received her Master's degree in French. After finishing her Master's degree, Christina worked for a tutoring center and realized she had a passion for children and education. She then pursued her teaching credentials through San Jose State University's joint credential/MA in Education program and went on to teach elementary school for 3 years. In her free time, she enjoys camping, hiking, reading, and trying to keep up with her French. She also spends quality time with her family and friends. 

Philip Truong, Assistant Center Director

Philip's passion is in the Education field working with children. Mathematics was his favorite subject in school and he remembers how rewarding it was to solve difficult math problems! He loves to see his students have the same attitude and confidence. He believes that having a strong foundation in math skills will further advance children's knowledge through high school and college which can be used later in adulthood. Philip has been a tutor and mentor all his life to his younger sister, who now attends University of California, Riverside.

Philip completed his Bachelor's Degree in Psychology at the University of California, Riverside. He enjoys being really active whether it's going to the gym, hiking, or biking. In his free time, Philip enjoys being with his friends exploring new restaurants in the Bay Area and traveling. His dream vacation is to go to Japan with his friends to try different cuisine and learn more about their culture.

Spencer Davis, Curriculum Advisor

Spencer's twin passions are Mathematics and play. He has taught in math classrooms across the Bay Area in California and in his hometown of Louisville, Kentucky, and tutored students in various subjects from elementary to collegiate levels. Spencer believes a strong mathematical practice equips students with the ability to relate concepts no matter the field. At Mathnasium of Redwood City, Spencer strives to help students with math anxiety to learn to be confident in their own abilities and knowledgeable in how to promote their own success. Spencer believes deeply in the power of individualized education and alternative teaching approaches.


Spencer earned his Bachelor of Science in Mathematics from Indiana University. Spencer is also an avid storyteller. He and his partner organize and host multiple board game and storytelling events in the Bay Area, where he teaches the value of play to adults. You may also encounter him exporing restaurants, walking his cat, or wandering the halls of the library.

CenterDirectorSarah Williamson, Resource Coordinator

Sarah's enthusiasm for Mathnasium comes from her passion for the intersection of mathematics and community. She has over a decade of experience tutoring and teaching STEM subjects at the K-12, collegiate, and adult learning levels. She previously worked for five years as a software developer and android platform analyst and as a technical instructor within the public sector in Washington DC. Along the way, Sarah discovered Mathnasium and began working evenings as an instructor for three years, where she realized how impactful Mathnasium could be. With her move to the West Coast in 2016, she made the transition into Education full-time with Mathnasium of Redwood City. She is proud to be serving the Redwood City and San Carlos communities. She believes Mathnasium is where bright futures are imagined and truly realized.

Sarah completed her engineering degree in Computer Science and Mathematics at Virginia Tech, with a focus on Communication Technology and Gender Studies. She spends her free time drinking coffee, exploring the outdoors, and volunteering with the local Food and Nutrition Center to promote community health and nutrition awareness. 

CenterDirectorBeatrice Chan, Owner / Managing Director

Beatrice earned her degree at the University of Illinois, Urbana-Champaign in East Asian Languages and Cultures with a Minor in Business. After earning her degree, Beatrice moved to Silicon Valley in 2001 and worked for 9 years as an Account Manager and Program Manager with startup companies that had a strong presence in the Education market.During that time, Beatrice was heavily involved with Healthy Cities Tutoring of San Carlos, teaching children before work. Realizing that there was a severe need for math enrichment, she soon after ventured on her own to tutor Math all around Redwood City and San Carlos. Her ability to help children understand the concepts of math and the demand for her services is what prompted Beatrice to open up a Mathnasium Center. 

Beatrice is passionate about making children knowledgeable and successful in understanding Mathematical concepts, all while having fun! She believes that being fluent in Math not only boosts a child's confidence, but also empowers them to reach their fullest potential. This passion is what drives her to be a proud member of the Mathnasium Family.

Mathnasium of Redwood City has a very strong, diverse team of instructors including post-college STEM professionals working in the Bay Area; college students pursueing math, science, and education degrees; and the top students from the local high schools. Our instructors come from a variety of backgrounds, participate in and lead numerous academic and athletic endeavors, and speak over nine languages. The incredible instructor team at Mathansium of Redwood City is well-known regionally, often hosting training events for other Bay Area Mathnasium Centers. While they all bring their own unique strengths and different qualifications to our team, they all have one thing in common: they have a passion for math and for teaching! Instructors from our center have attended or are attending the following schools: