Mathnasium 14452 Ventura Blvd, Sherman Oaks CA 91423 (818) 380-0169

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Currently Open for IN-CENTER and @Home instruction

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:

Larry Martinek, Mathnasium's Chief Instructional Officer and Founder: Staff training 2020


Barry and Lorye - Center Owners

Barry and Lorye are the owner's of Mathnasium of Sherman Oaks.

They have both had very successful carrers before making the center their passion.

Barry is a former Senior Vice President at Sony and a Member of the Executive Committe of the Academy of Motion Picture Arts and Sciences.  In both endeavors, he created new curriculum and learning models for the Industry. Formally shifting to academia, Barry recently published the well reviewed college textbook "Film-Making in Action".  In his philanthrapic work Barry served as President of the Board of Director's of one of Los Angeles most prestigious K-8 private schools.

He has his Bachelor's from Northwestern University and his Master's from USC.

Lorye is MASTER CERTIFIED  by Mathnasium.  At the Center, Lorye specializes in teachng our "First Steps" program and is our "Ninja Master Marketer".  She is an accomplished and published chef and the mother of four boys (all of whom had the privilege of being tutored by Larry Martinek, before he created the highly succesful Mathnasium system).  She began her professional career as a pre-school teacher and is a Sherman Oaks native growing up and educated right here in Sherman Oaks.  

She is a graduate of UCLA

Together they bring their passion for children and learning to the Center working with each family and student to insure their success at Mathnasium.


Andrew Landstedt, Center Director 

 Andrew received his Bachelors degree from the University of California San Diego. He discovered his passion for tutoring when he was in high school and decided to tutor middle school students after school. He discovered that his tutoring sessions empowered students to overcome their difficulties and succeed in school and life. Andrew has been tutoring students ever since! When Andrew isn’t helping students    with their math problems he loves going on outdoor adventures and recently won the hit  tv show Wipeout. 



Christian M., Assistant Director

Christian Medrano Instructor, Graduated from the University of California- Santa Barbara with a degree in mathematics and minor in education. He hopes to become a teacher within the next couple of years and has a long term goal to earn a masters in education and become a principal or special needs instructor.

He developed a passion for mathematics in the third grade, and has developed a love for teaching over years of mentoring. Has worked with kids of all ages via coaching, tutoring and being an instructor at a private school. Has a strong passion for helping others and bringing joy to the subject of Mathematics


Andre Dervi., Instructor Andre was born and raised in the San Fernando Valley. He received his Bachelor’s degree in Integrative Biology from the University of California, Berkeley. He hopes to successfully apply to Dental School. At Berkeley, Andre volunteered as an after-school tutor and mentor for the local middle school, interacting with students of all backgrounds. He also led a discussion class of his peers on the topic of Public Health in his last year there.

Towards the end of his High School years, Andre had his first job tutoring at Mathnasium. He quickly realized his passion for communicating mathematical ideas to students. He has been eager to return to Mathnasium to share his love of learning and math.

In his free time, Andre loves playing and listening to music, cooking food, and spending time with his loved ones.


Stephanie S., Instructor

Stephanie is currently attending Cat State University Los Angeles as a sophmore, pursuing a degree in Nursing.  She is planning on taking that degree into a position as nurse Practitioner or Physicians Assistant

Her joy of watching kids succeed come from the many hours she has spent mnay hours babysitting within her family. The incredible energy she brings to Mathnasium made an immediate impact on the learning outcomes of our students teaching them Math in a way that makes sense , leaving her students with the bielkief that they can do anything!

In her free time She loves trying out new food places and drinking boba.  She is also an avid video gamer, using a PC she built for herself from scratch.

Joie Y., Instructor

Joie is currently attending College of the Canyons as a sophomore pursuing an Associate's Degree in Nursing, and I hope to transfer to UCLA for a Master's Program. My long-term goal is to become a Nurse Practitioner specializing in children's health.

From as long as she can remember, she has always loved working with kids. As Joie volunteered as a T.A. in a preschool class, she began to realize how much she enjoyed little kids' enthusiasm and vivid imaginations when it comes to learning. She continued on working with kids in high school and tutored all subjects in her free time. Another one of her inspirations is her charming little brother, who teaches Joie his own unique ways of thinking everyday.

In Joie's free time, she is vice president for a club called Habitats for Humanity, where she aims to help fund for lower-income housing.  Her passions include playing guitar and singing, which she has been doing since she was very little, because of my love for music.



  Mac H., Instructor

Mac is a San Fernando Valley native, and a graduate of High Tech Los Angeles. Beginning in elementary school, Mac has taken as many opportunities as possible to babysit or tutor for other families at school. In his free time, Mac enjoys playing strategy games with his friends, exploring nature with his 3 dogs, and assisting with local pet adoption efforts. In coming semesters, Mac plans to return to school, putting his affinity for geometry and spacial reasoning towards a degree in architecture. 




Jay, Instructor 

Jay was born and raised in Boca Raton, Florida.  He received his Bachelor degree in Applied Psychology and Human Development along with a minor in Communications from Boston College. 

At Boston College, Jay developed a passion for service and teaching. During his Junior year of college, Jay assisted a 3rd grade class and specialized in helping the students in mathematics and reading comprehension.   




Ariana, Instructor 

 Ariana is currently enrolled in UC Berkeley and is pursuing her dream of becoming a Pediatric Surgeon.  


Her experience with assisting others through their academic endeavors comes from working as a homework club leader at an elementary school, private tutoring, and working as a French and Spanish instructor for L.A.N.G.O, a company that focuses on fun and interactive foreign language instruction for kids.


During her free time, Ariana finds enjoys dancing, doing yoga, playing basketball with her brothers, snowboarding, hiking, volunteering,  scrapbooking, and learning languages.



Our staff is comprised of bright minds and caring hearts who have attended, taught or voulnteered at the following institutions and many more:



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