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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:

Xavier Ruiz-Pantoja, Center Director

Xavier has been with the Mathnasium team since September 2014. Not only does Xavier have a passion for the subject of Mathematics, he wants to share his zeal for the subject with our students.  As Center Director, he is in charge of all student learning plans and directing the Instruction team to best help students meet their goals.

He attended Cal Poly Pomona where he has studied both Applied Mathematics and Accounting. 

What he loves most about Mathnasium is sharing in the joy that our student's feel when "a once confusing concept finally makes sense!"  

Alex Leon, Master Instructor

Alex has an extensive and impressive educational background, having studied Organic Chemistry, Mathematics, and currently Theoretical Physics.  As Alex was undergoing his studies, he noticed less and less students going into those fields of math and science.  He wondered, "Why could such interesting topics generate such limited participation?"  After applying for a position at Mathnasium, he quickly saw this as an opportunity to spread his ardor and excitement for math.  Now, as our Master Instructor, Alex trains and develops the Instruction teams of various Mathnasium centers around the San Gabriel Valley.

Alex is addicted to the smiles on our student's faces.  He finds it rewarding to watch student's grow and gain confidence in math.  His ongoing goal is to generate more interest, critical thinking and fun in the subject of mathematics.  

To stimulate all parts of his brain, Alex plays music daily - from bass, to drums, to piano.  He also enjoys painting, in which he typically completes a project every 3 - 4 months.

Ian Tran, Lead Instructor

Ian first heard about Mathnasium through a classmate in college, where he was studying Mechanical Engineering.  Since he enjoyed math, he applied for a job and was immediately hired at the Eagle Rock center in early 2016.  Since Ian lives in Monterey Park, he transferred over to this center and has enjoyed working with the kids in this community since September 2016.   As the Lead Instructor of the Monterey Park center, he is the primary liason between our students, the parents and the rest of our Mathnasium team.

Some of Ian's interests (other than math) include: photography, mechanical watches and video games.

Juan Mendizabal, Instructor

Juan started working at Mathnasium as a freshman in college, back in 2014.  He remembers back taking AP Calculus in his senior year in High school, and having a very difficult time with the class.  To tackle the challenge, he spent amny afterschool hours with his teacher, he spent extra time studying at home, and kept reviewing everything until it all started to make sense.  Now, he wants to be that extra help for students who need it - and, that's why he's here at Mathnasium!

And, yes, he passed the AP Calculus test with a 5.

Hong Yu, Instructor

Hong has an impressive background in Aerospace Engineering, and brings over a decade of tutoring experience to our center.  Before joining Mathnasium, most of his tutoring experience was done at the college level, where he served as Lead Tutor.  Hong admits that he felt slightly nervous when he first joined our team, since he had little experience working with younger students.  However, he quickly saw how our teaching techniques really get students to understand math in a way that actually makes sense.

Hong still dreams of becoming an Aerospace Engineer, where one day he will be building spaceships and designing technology to explore the vastness of outer space. When he is not teaching (or dreaming), he stays relatively grounded by reading non-fiction materials on science, engineering and aviation.  He also likes to keep up with sports and current events.

Michael Choi, Instructor

Michael began Mathnasium as a student, at the age of 11.  He valued the bond that was created between Instructor and Student so much so that he envisioned himself working as an Instructor - connecting with younger students to help them see the wonders of mathematics.   He remembers countless hours mesmerized by calculus books, finding the math ever so enchanting.  He truly considers Math as his first love.

It is hard to imagine a more dedicated Math Instructor than Michael, especially considering his various extra-curriculur interests: Cross-country, Speech & Debate, Math Club, Math Team, National Honor Society, Chess (just to name a few).  Michael is also a Boy Scout, which might help to explain his work ethic.

As a High student at Mark Keppel High School, he has taken rigorous courses such as AP Physics as well as a ton of math classes.   He understands that teenagers need time to relax, too, so he will enjoy his free time by watching Marvel movies and hanging out with friends.  He's already landed his dream job as an Instructor at Mathnasium; his next goal is to get into a prestigious university as the starting point for a dream career.

Titus Tjahjadi, Regional Director

Titus started his career at Mathnasium as an Instructor in 2007.  Because of his leadership skills, he was promoted to be the Lead Instructor, and then to be the Assistant Director of the Mathnasium center in Pasadena.  He then served as the Center Director of the Pasadena center before his most recent promotion to Regional Director.  As a Regional Director, Titus oversees the management of the Mathnasium centers in Pasadena, South Pasadena and Monterey Park.  Because of his commitment towards excellent customer service and student progress, he stays passionately involved in student instruction, as well as the training of our team members.

Titus received his Computer Science degree from Cal Poly Pomona.  He is a self-proclaimed foodie, who is not afraid to create his own dishes.  He also enjoys travelling and seeing new sights.