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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:

Math Instructors and Education Specialists

Our instructors scored collectively one of the highest scores in the Mathnasium organization (over 800 locations) on all employment tests - not to mention three perfect scores on Math SATs and the rest scoring very close to perfect.  Most of all, they are blessed with the most important criterion: They love teaching math with care, compassion, and respect to our students! Way to go guys!

Larry Martinek, Creator of the Mathnasium Method

Larry has spent his entire career finding a better way to teach math. From the inner city to public schools, to acclaimed magnet schools, to leading private and parochial schools, Larry has served as both a classroom teacher and as an educational consultant. He has designed curriculum, teaching strategies, and teaching materials designed to help students and teachers learn math more effectively, He has trained teachers in the art and science of boosting students' ability to "do" math, thereby increasing students' math scores and feeling of self-worth. Larry is the developer of Mathnasium's educational program - one of the most comprehensive and innovative curriculums ever produced for teaching math.

While Larry is not an instructor at our center in Garden Grove, he has personally trained Mason to be one of the best center directors.  He also is a valuable asset and we can call on him to ask specific student's scenarios for guidance and advice. This has helped to make visits more productive and enjoyable for many of our students.

Center Director


Mason grew up in Orange County and always loved math.  He graduated from University of California, San Diego with double majors in Economics and Psychology.  Mason was very successful in every field from the investment industry to the hi-tech industry - and also building several lucrative small businesses.  He realized that his mathematical ability was the basis for much of his success.  Mathematics did not only foster his foundation of the logical thought process, it also helped Mason with every aspect of his businesses from meticulous daily projects to very difficult negotiations.  In process of searching for the new and better businesses, Mason came across Mathnasium Method which used revolutionarily different delivery and teaching process and it was extremely effective.  

Experiencing the power of knowing math, Mason now wants to bring that gift to our younger generation through Mathnasium Method.  That is why Mason loves helping students understand mathematical concepts in a way that makes sense to them and seeing them become more enthusiastic about the subject.

Rachelle Reiff - Instructor


Rachelle is currently majoring in Mathematics and minoring in both Philosophy and Drama at the University of California, Irvine. She is in the university's Campus-wide Honors Program and has plans to earn a Ph.D. in Mathematics with an emphasis in mathematical logic. Rachelle has been a Girl Scout for the past fifteen years and has led many Girl Scout camps and events. She has years of experience with children of all ages and has a great enthusiasm for math and math education. In her free time, Rachelle performs with UC Irvine's improvisation group, Improv Revolution.


Trung Tran - Instructor


Trung Tran is currently attending Cypress College pursuing a degree in physics and math. He is a graduate of the intensive Naval Nuclear Propulsion Program and has served in the United States Navy for 8 years. Trung's military experience has inspired his passion for math and physics. In addition to being an invaluable member of the Mathnasium team, he also works as a multivariable calculus tutor for Cypress College Learning Resource Center. Trung believes in a solid foundation of analytical and critical thinking via learning math will empower students of all ages to be successful in school and beyond.  


Jesse Peraza - Instructor


Jesse is currently pursuing a B.S.  in Mechanical Engineering at California State University, Long Beach. Mathematics is one of his favorite subjects he enjoys studying and teaching.   Jesse enjoys instructing at Mathnasium, because he loves helping children understand the fundamentals of mathematics, in a way that is best for them. Here at Mathnasium is where he wishes to share his passion for math with other students and making their learning experience fun! During his leisure time, he enjoys paintball, drive-in movies, and spending time with his wife and two-year-old son. 


Kenny Le - Instructor

Kenny is a Biophysics major at UCLA. Throughout his academic career, he has developed a strong passion for science and math. Through a deep understanding of math and science, Kenny believes that anyone can turn the outside world into their own intellectual backyard. Kenny wants to carry his passion for the sciences over into the medical field and become a physician. He sought a job at Mathnasium to share his passion for math and learn how to communicate with people--a skill that cannot be taught in any textbooks. Kenny will continue to pursue positions that will allow him to help people and better his communication until he reaches his dream career.

John Hong - Instructor

John was born in Korea and has lived in Garden Grove since 2006 when he was 8. He is currently pursuing a bachelors degree in mathematics at California State University, Fullerton and is expected to graduate in spring 2019. For two semesters, he tutored other college students who struggled with their math courses Upon getting his bachelors degree, he plans to go into the masters program, perhaps even further into math in order to become a college professor. Ever since he was young, he thought of math as the only way to become successful since it is his only subject of interest for him and he has always found math to be fun to learn. John came across Mathnasium and knew this is the place for him, where he can focus on helping students with just math and 'nothing but math'. Being a mathematics major, John has the passion for the subject and really enjoys talking to students about math and seeing them understand and firmly grasp onto previous or new concepts.


Riley Matsuda - Instructor


Riley is currently pursuing a degree in bioengineering at the University of California, Los Angeles.  After graduating, he plans on applying for a Master’s Entry to Clinical Nursing program.  Riley has previously worked as a math and science tutor for both high school and elementary school kids.  These experiences eventually led him to become an instructor at Mathnasium.  He enjoys archery, basketball, and traveling.


Michelle Nguyen - Instructor


Michelle is currently studying Biology at Orange Coast College with the goal of transferring to a UC in order to finish her degree. Although she is majoring in biology, she has always had a passion for math. Prior to becoming an instructor at Mathnasium, she was a private tutor for 8 years, teaching students from kindergarten through 12th grade an array of subjects. Seeing her students grow as they advance through their academic careers is one of the many reasons why she loves to teach. Through Mathnasium and their unique techniques and approaches towards math, she is ecstatic to be able to guide many students who have the potential to advance significantly towards their goals confidently. When she is not working towards her degree or teaching, she is always searching for exciting things to do. She loves watching movies, listening to music, taking photos, enjoying delicious food, going on adventures (hiking, camping, bouldering/rock-climbing, traveling), spending time with her friends and family, and volunteering at local communities and organizations. Alongside her goal to go to medical school, she would love to go skydiving and to travel to many new places.


Nick Cassar - Instructor

Nick is from Los Alamitos, and is currently pursuing majors in math and physics.  He does astrophysics research on the computational modeling of protostellar star-disk systems.  He has always found math interesting and loves teaching others about how interesting and mind-blowing math can be.  After college, he plans on attending graduate school to study astrophysics and become a professor.  In his spare time, Nick enjoys learning math, physics, jazz, and playing the saxophone.

Brian Du - Instructor

 Brian is currently attending Coastline Community College and will be transferring   to CSU Long Beach in the fall of 2018. A secondary education mathematics   major, he has a deep interest in finding the most fruitful methods of instruction   for students of all ages; he finds tutoring and teaching to be rewarding for both   his students and himself. Though specifically interested in teaching math at the   high school level, he loves to see students grow in the ways they look at and think   about everything. As a lifelong musician and performer, Brian places a   tremendous value on creativity and ingenuity. When not at Mathnasium, you can   find Brian working at Pacifica High School with the AVID program, at Compass   Bible Church writing and recording music, or reading up on the latest Star Wars   lore, Marvel comics, and memes.