Our staff is built to teach each student individually, to develop the skills they need to thrive in mathematics, and to foster a love of learning.

David Krull

Owner/Center Director

David Krull earned his bachelor's degree in Physics from UC Davis and has taught math and nuclear physics for the U.S. Navy, as well as software and technical training in Silicon Valley. He also ran a web design firm and continues to consult in software and custom woodworking. 

David enjoys sharing his love of math and science, especially when students experience that "aha!" moment. Outside Mathnasium, he’s a beekeeper, falconer, and devoted community volunteer. His favorite number is 1/7 for its fascinating decimal pattern, and his favorite math joke involves binary code. 

Aziz

Assistant Center Director

Aziz Hosseini has loved math since elementary school, appreciating its logic and the certainty of correct answers. He studied Physics in college and works as a CNC operator alongside his role at Mathnasium. 

Aziz enjoys helping students reach moments of clarity in their math journey. He believes in the power of persistence and encourages students to explore new ideas. In his free time, Aziz enjoys hiking, anime, and playing pool. His favorite number is 3 and favorite math joke reminds us there are “three kinds of people, those who can count and those who can’t.” 

Cuong

Lead Instructor

Cuong holds a bachelor’s degree in Mathematics for Secondary School from UC Riverside. He values the precision and logic of math, and he loves sharing his passion with others by making concepts approachable and fun. 

Cuong encourages students to explore multiple ways of solving problems and brings a positive, energetic presence to the center. He volunteers as an Assistant Cubmaster and enjoys camping, movies, and spending time with family. His favorite number is 16, and he believes being “weird” is a wonderful quality that keeps life interesting. 

Sandy

Lead Instructor

Sandy earned his master's degree in Applied Mathematics from Caltech and spent 37 years in computer disk drive development, holding over 25 U.S. patents. He brings a lifelong passion for numbers and number patterns to his tutoring at Mathnasium. 

Sandy encourages students to regard numbers as friends and enjoy the beauty of math. He’s volunteered extensively in local schools and coached youth sports for decades. His favorite number is the golden ratio, and he enjoys sharing math jokes and quotes, especially “Parallel lines have so much in common… it’s a shame they’ll never meet.” 

Vic

Instructor
Victor has a bachelor’s degree in Finance from San Jose State University. He has roughly 20 years experience working as a corporate financial analyst with various companies throughout Silicon Valley. Before he found his calling in Finance, Victor took classes at Cal Poly San Luis Obispo in Electrical Engineering and completed math classes up though and including differential equations. Victor has always had an affinity for math and loves problem solving. In his spare time, Victor loves playing sports like basketball and football and plays fantasy sports in those areas as well. He believes he’s a pizza aficionado and enjoys writing lyrics and producing songs in various genres of music.

Favorite Number: 7, because as a youth I looked up what numbers were lucky and that one stood out.

Favorite Math Joke: I put my root beer in a square glass. Now it's just beer.

I love Mathnasium because it gives me a chance to express my passion for mathematics in a fun and creative way.

Jyoti

Instructor
I have a bachelor's degree in Electrical & Electronics Engineering from India's top school, and have worked in IT industry for the last 25 years. Math and solving problems have always been a passion of mine. I find great satisfaction in helping children solve math problems. I believe love for math needs to grow.

Favorite Number: 9, because counting by 9 is so cool...

Favorite Math Joke: What did the triangle say to the circle? "You're pointless."

FunFact: Jyoti loves gardening.

Taesu

Instructor
Hi! I'm Taesu, a freshman at West Valley College. Math was my best subject throughout high school; I was in an honors or AP course for all four years. I feel comfortable teaching math, as I was raised not to view it as needlessly painful or "hard," but rather as a challenge to overcome and a fun game of intuition. I find the interconnectedness of seemingly disparate concepts fascinating; the application of matrices in plane geometry and the use of integrals in three-dimensional geometry endlessly excite me. I'm a firm believer in the student's abilities; I feel most fulfilled when I guide them halfway through a problem and let their math instincts kick in so they can solve the rest. I enjoy spending my free time playing video games and cooking.

My favorite number: e, because it is ubiquitous in nature.

Math joke: Why do mathematicians love forests? Because of all the natural logs.

Juliana

Instructor
Hi I'm Juliana! I am currently in high school but I have enjoyed math since I was little because there are so many different ways to solve a single math problem. I love helping others learn math because teaching math in fun and creative ways can make others learn to love math as well! In my free time, I like to swim, draw, and spend time with my friends and family.

Favorite number: 1, it is neither prime nor even and it represents a whole!

Favorite math joke: Why did the obtuse angle go to the beach? Because it was over 90 degrees!

Johan

Instructor
Hi! My name is Johan and I'm a junior in high school. I enjoy working with kids and I have tutored a variety of subjects. Math has been my favorite subject since elementary school, especially because of its structured nature. I enjoy teaching math, especially while teaching new concepts and helping students solve challenging questions. In my spare time, I spend time with my family and listen to music.

Favorite Number: 3, it's always been my lucky number!

Favorite quote: "Life moves pretty fast. If you don't stop and look around once in a while, you could miss it." - Ferris Bueller

Preston

Instructor
Hi! I’m Preston, and I’m a junior at Accel Middle College. I’ve been doing competition math for many years, and I ended up at Mathnasium through my love for teaching. I believe that math is the most important subject because it teaches you to think logically and to be efficient. (And best of all, it's fun when you get it!) Whenever I have time, I practice my piano, guitar, and sing for my band.

Favorite Number: 7, because it’s lucky and prime

Favorite Quote: “Seize your moment” - Coco

Andrew

Instructor

Hello! I’m Andrew and I’m currently enrolled at Leland High School. I love getting lost in the routines of solving a math problem the way an artist gets lost in their painting, after all, they’re both art in a way. I enjoy teaching here because I get to see the expression of happiness on the faces of students after they finally “get it”. When I’m not working, I enjoy the outdoors (Almaden Quicksilver County Park is amazing), listening to music (concerts are fun), and working out.

Favorite number: 27 because for some reason, it always seemed the coolest…like I knew since I was little that 27 had the best personality out of all numbers (if numbers had personalities)

Favorite math joke: Why was the mathematician late to work? He took the Rhombus!

Favorite quote: "We must accept finite disappointment, but never lose infinite hope." - MLK

Ishaan

Instructor

Hi! I'm Ishaan, a student at Leland High School. Math has always been my favorite subject because there's always a right answer. I love teaching at Mathnasium because it's super rewarding seeing the students gradually improve and eventually master a topic. In my free time, I enjoy spending time with my friends, doing robotics, and running.

Favorite Number: 4, I don't know why, it just seems right

Favorite Math Joke: What's a math teacher's favorite type of tree? Geome-TREE

Aamir

Instructor

Hello! I'm Aamir and I'm a student at Leland High School. Math has always been my favorite subject because of how it follows rules and has a right answer. I enjoy teaching here because I love communicating with the students and solving difficult problems with them. In my free time, I enjoy robotics and spending time with friends.

Favorite number: 5, it's a very balanced number, right between 0 and 10.

Favorite Math Joke: Why did the student eat his math homework? Because the teacher told him it was a piece of cake.


Lara

Instructor

Hey there! I'm Lara, a graduating senior from Leland High School and an incoming freshman at Santa Clara University (go Broncos!). Math has always been my favorite subject, and I especially love how many different paths can lead to the same anwer! Even more rewarding is helping others build their confidence in math. Outside of Mathnasium, you’ll probably find me hiking up a trail, playing piano, getting way too competitive in video games, or listening to music. 

Favorite Number: 22/7 — because who doesn’t love an infinite slice of pi?

Favorite Math Joke: How do you stay warm in a cold room? Just go to the corner. It’s always 90 degrees!


James

Instructor

Howdy! I'm James and I'm a Senior at Leland High School. I love math because it's incredibly intuitive! Math concepts are always straight-forward and serve a practical purpose, whether it be theoretical or in our everyday lives. When I'm not racking my brain over integrals and statistics, I'm usually debating for Leland's debate team, snacking on delicious foods with friends, or napping.

Favorite Number: 42 because it's the meaning of life! Or so I'm told...

Favorite Quote: "I’ve missed more than 9,000 shots in my career. I’ve lost almost 300 games. Twenty-six times I’ve been trusted to take the game-winning shot and missed. I’ve failed over and over and over again in my life. And that is why I succeed." - Michael Jordan


Anjika

Instructor

Hi! I’m Anjika, a junior at Leland High School. I’ve been doing math for as long as I can remember, and love it partly because it always leads to a clear answer, but also because there are countless paths to get there! I also enjoy the unique puzzle-solving and analytical aspects of it that aren’t in many other subjects. Whenever I’m not working on math problems, I’m usually playing video games, competing in debate tournaments for Leland, or out with my friends.

Favorite Number: 4. It’s in the perfect spot - not too low and not too high.

Favorite Math Joke: Why won’t Goldilocks drink a glass of water with 8 pieces of ice in it? Because it’s too cubed.

Favorite Quote: "Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt.” - Sun Tzu, The Art of War


Our Mathnasium Mission

Teach children math so they understand it, master it, and love it. Math can change their lives, and they can change the world.

Quote Quote
What I love about Mathnasium is the ability to teach problem-solving skills and make math make sense, while also making a student smile.
Amber W., Mathnasium Instructor

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Student using math cubes to solve fractions
Student working with a math tutor at a local math learning center

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