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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:

Jennifer Krull, Center Director/Owner

Jennifer has a bachelor's degree in Applied Mathematics. She spent four years as an officer in the Navy teaching mathematics and reactor dynamics in the Naval Nuclear Power School. Upon leaving the Navy, Jennifer found work as a technical instructor with Applied Materials, teaching operation, function, and maintenance of semiconductor manufacturing equipment.

Jennifer was fortunate enough to spend several years out of the workforce to raise her children, currently ages 15 and 17 now attending Leland High School. During that time she enjoyed volunteering to teach art and ceramics in her kids' classrooms at Lietz Elementary School, run the annual school talent show, and was also a Girl Scout Leader for five years. She spent three years as a substitute teacher for San Jose Union School District, but finds her real joy is in working individually with students to give them exactly what they need to discover and learn. After tutoring math privately from middle school pre-algebra students to high school calculus, Jennifer knows her passion is in helping kids to understand math. She loves being able to present the material in a way the student can understand and allowing them to learn at their own pace.

Favorite Number: 12, because I love how you can share it so many ways.

Fun Fact: Jennifer's enjoys fostering kittens for a rescue group and playing Dungeons and Dragons.

I love Mathnasium because every student deserves to be approriately challenged in a fun and caring environment.

Center Director/OwnerDavid Krull, Center Director/Owner

David earned his bachelor's degree in Physics at UC Davis, where he also worked as a tutor in Math and Physics. Since then he has taught Math and Nuclear Physics for the U.S. Navy, provided training for technicians in the semiconductor fabrication industry, as well as technical & software training for several other Silicon Valley firms. He created and ran a small web design firm, continues to provide software consulting services to small businesses, and creates custom woodworking pieces in his spare time.

David has served his San Jose community as a Cub Scout Cubmaster and Den Leader, and finds great satisfaction in exploring just about any math or science topic, and even more satisfaction in sharing what he's discovered with kids as well as adults. He loves to witness that "ah ha!" moment in a child's face, as it lights up with true understanding and new-found confidence in concepts that were once perceived as too difficult.

Favorite Number: 1/7, because it has a super-cool decimal expansion ( 0.\overline{142857} ) and you can figure out 2/7, 3/7. 4/7, 5/7, and 6/7 using those same digits.

Favorite Math Joke: There are 10 kinds of people in the world - those who understand binary, and those who don't.

Fun Fact: Dave has recently taken up beekeeping!

InstructorSandy, Lead Instructor

Sandy has a master's degree in Applied Mathematics from the California Institute of Technology. He has 37 years of experience in computer disk drive product development with IBM/Hitachi GST, and holds over 25 US patents. He worked in application software development, and managed the air bearing slider design team. His passion for math grew out of his love for numbers and number patterns. Encouraging students to look for these patterns and to "regard numbers as a friend," is the way he approaches tutoring. Watching a student's math skills and confidence improve is extremely fulfilling to Sandy because he knows it will benefit them for the rest of their life. Sandy has been a volunteer tutor for algebra and pre-calculus at local high schools, as well as general math at his granddaughter's elementary school. Sandy spent 20 years as a coach and manager for San Jose Pacific Pony Baseball, and he is currently the scorekeeper and statistician for his son's adult softball team. Since 1973, he and his wife Mary Hope have called San Jose their home. Spending time with his wife and their family is one of his great joys.

Favorite Number: (1+√5)/2

Favorite Math Joke: Parallel lines have so much in common. It's a shame they'll never meet.

Favorite Quote: "Be the change you want to see in the world."

I love Mathnasium because  it makes math fun for all those students who have missed out on the fun.

Cuong, Lead Instructor

Cuong has a bachelor's degree in Mathematics for Secondary School from UC Riverside. Not only does he love math, but he has found that he loves to share his knowledge with others so that they may enjoy it with him. The thing that he likes most about math is that every problem has an exact answer. However, the methods of coming up with the answer are numerous. Cuong currently volunteers as an Assistant Cubmaster. He finds it amazing how he can continue learning new things everyday. "Pure mathematics is, in its way, the poetry of logical ideas." -Albert Einstein. Cuong's methodology is to think logically. This is this and that is that! If something doesn't work, find another way. If something works, use that in other topics. He believes that being weird is a quality that is a must because it makes you unique and keeps life interesting. Cuong enjoys movies, camping, and spending time with friends and family.

Favorite Number: 16! It's my birthday.

Favorite Math Joke: There are 10 types of people in the world: those who understand binary and those who don't.

I love Mathnasium because: the kids love it! The atmosphere is just perfect. Kids come in and are eager to learn. I am happy to be part of that journey with them.



Aziz, Lead Instructor

Hi, My name is Aziz. I've been a part of the Mathnasium family since 2015. I studied physics at San Jose State University. I enjoy working with kids very much. In my free time I play the guitar. I also enjoy playing pool and going on hikes. Aside from Mathnasium I work part time as a tournament director at a local pool hall called Cuetopia here in San Jose.

Favorite Number: 3, because I am one of three kids.

In Five years I will be: hopefully, a full time teacher.

I love Mathnasium because it creates a positive and supportive environment for kids to learn about math, and I feel very lucky to be part of that.





Chuck, Instructor

I simply enjoy working with young people, especially with math.

Although I am retired (18 years in Silicon Valley with semiconductor equipment engineeringand product marketing and 11 years as a Financial Advisor), I have been a substitute teacher (high school and middle school) for almost 10 years.  I have also tutored HS students (primarily Math and Science & preparing for "SAT" exam).

My degree is in Physics/Math (Western Connecticut State Univ.) and studies toward an MBA (Univ. of Connecticut and San Jose State Univ.).

I am married, we have two adult sons, and I am a veteran – Air Force, VietNam.

Leisure Activities include: traveling, photography, coin collecting and golf.

Favorite Quote: "I expect to pass through this world but once.
Any good therefore that I can do, or any kindness or abilities that I can show
to any fellow creature, let me do it now.
Let me not defer it, nor neglect it, for I shall not pass this way again."
-  William Penn



Kris, Instructor

Hey I'm Kris.  I am studying physics at San Jose State.  I am passionate about math because it is a valuable tool used to describe how the universe works, and there are many different ways to solve the same problem. In my free time I am probably drawing, reading, or riding my bike. I know math is a challenging subject, but the reward from grasping new ideas is greater than anything else.   "The more you know, the more the world opens up to you." - Adam Friedman


Favorite Math Joke: Without geometry, everything would be pointless!

Favorite Number: 42, it's the answer to everything.

In 5 years I will be: hopefully done with my masters degree and will be pursuing a PhD.

I like Mathnasium because I get to give kids a different experience with math than I was given, which I struggled with when I was their age.



Edik, Instructor

Edik is a senior at Branham High School. He likes learning and discovering ways that math concepts connect together and fall into place. He relishes in the opportunity to help others with their math skills and challenging concepts. He is passionate about the engineering classes at Branham and is hoping to major in electronics at UC Berkeley. During his free time, Edik likes to read or have fun with his friends over the internet. Through Mathnasium, he hopes to learn how to better instruct others and how to manage many different tasks simultaneously. 

Favorite Number: 9

Favorite Math Joke:

   Person A: "What is the integral of 1/cabin?"

   Person B : "Log cabin"

   Person A: "Nope! Houseboat - you forgot the C."

In five years I will be: graduating from a 4 year university after experiencing life as an adult for the first time.

I love Mathnasium because people come not only to learn, but to enjoy themselves in a supportive and friendly community.


Patrick, Instructor

My name is Patrick Cady and I am currently pursuing a career in mathematics education.  I received my BA in math from UC Santa Cruz with a concentration in computational mathematics.  Systems of differential equations and probability theory were my particular areas of interest as an undergraduate.  I believe mathematical reasoning and algebraic thinking are indispensable skills for future generations.  Outside of math I am passionate about skateboarding, photography, music and hockey.

Favorite Number: 43

Favorite Math Joke: I'm not sure how many problems I have, because math is one of them.

In five years I will be: just hoping to be alive and healthy in five years.

I love Mathnasium because I enjoy helping students develop a deeper understanding of math concepts and number sense.



Alex, Instructor

Hello! The name is Alex, and I am a graduate of UC San Diego with a B.S. in NanoEngineering / Materials Science. I have a passion for problem solving, and I love seeing different people’s perspectives and approaches to the same problem. For every problem, there are infinitely many paths to the solution, and math is no exception! My goal at Mathnasium is to go further than just teaching math by building confidence and a solid foundation in kids’ problem solving skills that will allow them to  pursue whatever goals they may have in the future. 

My hobbies include cycling, tennis, and eSports gaming. In fact, back in San Diego, I helped run Pokemon eSport events! What many don’t realize is that it’s much like chess with an element of probability management. Many are surprised by how much math and calculations high level competitors put into this game!


Emma, Instructor

Emma is a senior at Branham High School. She enjoys working with children. In her free time, she likes to play the flute, go biking, and spend time with her friends.

Favorite Number: 12 (the day of her birthday)

Favorite Math Joke: 4 out of 3 people don't understand fractions.

I love Mathnasium because I enjoy helping others succeed.


 Aimee, Instructor

Aimee is a senior at Leland High School and math is her favorite subject! She enjoys learning it as much as teaching it. At school, she tutors students in math and Spanish through the Leland Peer Tutoring Club, and is always trying new ways to explain concepts. She is captain of the Leland High School's dance team, and also dances at nearby Capitol Dance Company after classes. She loves playing piano, traveling, dancing, and Disneyland.

Favorite Number: 1 - it's no one else's favorite number

Favorite Math Joke: 4 out of 3 people get fractions wrong.

I love Mathnasium because I get to meet great students and help them i the subject I am most passionate about.







Lovish, Instructor

Hi, my name is Lovish Nayyar. I am currently studying Chemical Engineering at San Jose State University. I love math because it's very logical and everyone can understand it. I also enjoy teaching very much because it allows me to make a positive impact in someone's life. In my free time I like to play sports, particularly football and baseball. I also like to solve puzzles like the Rubik's cube.

Favorite Number:  -1/12, because amazingly, it is the sum of all positive integers from one to infinity.

Favorite Math Joke: Why did the obtuse angle go to the beach? Because it was over 90 degrees.

I love Mathnasium because it allows me to combine two things that I love the most, and those are math and teaching.


Kelly, Instructor

Kelly is a senior at Branham High School. She enjoys math because it is a versatile subject that can be used to solve a variety of real-world problems with different approaches. She was born in South Korea and immigrated to the United States at a young age. She lived in Seoul, Los Angeles, and Sunnyvale before moving to San Jose. In her free time, Kelly enjoys playing video games, watching k-dramas, listening to music, and drawing!

Favorite Number: 10, because a 5-pointed star has 10 sides.

In five years, I will be: graduating from a four-year university with a degree in Bioengineering!

I love Mathnasium because it is a fun environment where kids learn to love math. I love to hear when kids come back to Mathnasium and tell me about their math accomplishments at school!


Katie, Instructor

Katie is a senior at Leland High School. She enjoys math as well as her history, animation, and sign language classes at school. Outside of school, Katie has been competing in Scottish Highland Dancing for 8 years. She loves to see herself improve because of all the hard work she puts into her sport. Katie is also in love with all things Disney, Marvel, and Harry Potter - go Hufflepuff!

Favorite Number: 11 (her name begins with the 11th letter of the alphabet. It's also her lucky number!)

In five years I will be: graduating from college with a nursing degree!

Favorite Quote: "Happiness can be found even in the darkest of times, if one only remembers to turn on the light." - Albus Dumbledore


Sheba, Instructor

Favorite Number: 19

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

In five years I will be: starting graduate school, God willing.

I love Mathnasium because I've always enjoyed math, and more importantly, I really love working with kids. It is super awesome that I get to share my passion for math with others.



Kunal, Instructor

Kunal is a senior at Branham High School. On campus, he is proud to be president of the Mathematics Olympiad chapter and the Programming Club. He likes math because of its logic, certainty, and omnipresence throughout life. In his free time, he enjoys playing basketball, making music, and reading. He is very excited to work at Mathnasium and hopefully share his passion about math with other people.

Favorite Number: 9

Favorite Math Joke: A farmer counted 196 cows on his field. But when he rounded them up, he had 200.

I love Mathnasium because people are motivated to learn and improve, and it is a supportive environment for all.


Victor, 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.


Jerry, Instructor

Jerry is a junior at Leland High School who is looking to major in civil engineering. He has been a lifelong follower of math and has participated in several math competitions, such as the American Invitational Mathematics Examination. At school, he also participates in quiz bowl and does peer tutoring. He loves how elements of math build up on each other and the infinite applications of math. In his free time, he likes to play trading card games and build expert LEGO sets. Jerry is excited to teach at Mathnasium and hopes he can get his students to love math like he does.

Favorite Number: 6

Favorite Math Joke: Why was 6 afraid of 7? Because 7 8 9!

Fun Fact: 2 x 9 + 2 + 9 = 29. Try doing it for any number that ends with 9!

I love Mathnasium because students don't just memorize formulas - they understand the reasoning behind what they are doing.


Emily, Instructor

Emily is a senior at Leigh High School. She has lived in San Jose all her life. She enjoys math because it's logical and can be widely applied to life problems. In her free time, she likes to play piano, watch movies, and wander around trails.

Favorite Number: 10 (because it's an even number and a multiple of 5)

Favorite Math Joke:  What do you call friends who love math? Alge-bros

In five years I will be: hopefully with a better sleep schedule and graduating with a degree in something I love!





Richard, Instructor

Richard is a graduate student at San Jose State University where he is currently pursuing his M.S. degree in Chemical Engineering. He holds a B.S. in Chemical Engineering from De La Salle University and is also a licensed chemical engineer in the Philippines, where he was born and raised. He has over three years of tutoring experience where he has taught various mathematics courses from Algebra up to Differential Equations. In his spare time, he enjoys playing video games, watching documentaries and crime series, traveling, and spending time with family and friends.

Favorite Number: 20 (birthday)

Favorite Math Joke: What is the integral of (1/x) dx from 1 to deGeneres? Answer: Ellen deGeneres

In 5 years I will be: graduating (hopefully) with a PhD in Chemical Engineering

I love Mathnasium because: it allows me to teach math in a unique and creative way that is fun not only for the students, but for me as an instructor as well.