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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 16 and 18 now attending Leland High School and the other starting college. 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.


Katie, Instructor

Katie graduated from Leland High School and will attend West Valley College where she will be pursuing becoming a nurse. 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 9 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




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.



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.


Alan, Instructor

Alan is a student at Pioneer High School. His passion for math stems from his love for problem-solving and exploring new concepts. Additionally, he strives to make math easier and more accessible for students. In his free time, Alan enjoys camping, playing the piano, and spending time with his friends. At school, Alan is an active member of the Leadership program and serves as class president. He is also part of the Pioneer swim and water polo teams.

Favorite Number: 22

Favorite Math Joke: (p+l)(a+n) = pa + pn + la + ln.... I just foil

I love Mathnasium because: it gives me an opportunity to share my knowledge and passion for mathematics, and I love watching students grow.


Xiaomian, Instructor

Xiaomian is a junior at Branham High School. At school, she enjoys sharing complex math problems and solutions with her peers. Xiaomian is also a passionate participant in the Branham STEM program and aims to be an engineer in the future. Much like her dream career, Xiaomian enjoys teaching math to help others achieve proficiency in their daily interactions with numbers. Outside of the world of math and STEM, Xiaomian also enjoys playing the flute in the Branham Wind Ensemble and is also a proud member of the California All-State Honor Ensembles. She also loves gardening and hopes to share her passion for the environment with her peers.


Favorite Number: 2

Favorite Math Pun: Sin(gerine)/Cos(gerine) = TANGERINE

I love Mathnasium because: Mathnasium is a home to curious students who will not only enjoy math but will also learn the real-life application of mathematics.


Shaw, Instructor

Shashank, or "Shaw", is a senior at Pioneer High School. His passion for math stems from a vast array of appliable skills he has acquired in his academic journey. Shaw is involved in many math clubs at school like the Castillero Math Tutoring Club and Geometry Club where he strives to enhance not only his own, but also others' understanding of math. Shaw is also captain of the Varsity Tennis team.

Favorite Math Joke: The problem with math puns is that calculus jokes are all derivative, trigonometry jokes are too graphic, algebra jokes are usually formulaic, and arithmetic jokes are pretty basic. But I guess the occasional statistics joke is an outlier.

In five years I will be... Hopefully attending grad school or medical school!

I love Mathnasium because it provides me with an opportunity to strengthen my own foundational math skills and help younger students in enhancing their own mathematical prowess.

 Muskan, Instructor

Muskan is a senior at Leland High School. She loves to sing, write, and take pictures as much as she loves to discover patterns in math. She likes to watch action movies and read long novels. In her free time, you might find her doodling everywhere, even her hands!

Favorite Math Joke: I'll do algebra. I'll do trigonometry. I'll even do statistics...but graphing is where I draw the line.

Favorite Number: 5

I love Mathnasium because it's an amazing learning environment, and it shows students that math is something to embrace and love.





Kesha, Instructor

Keshavan, or "Kesha", is a senior at Branham High School. When he was younger, he always had a hard time doing math, but soon he found himself loving the subject. Now, he's a math tutor at his school where he tutors high school students as well. Along with teaching math, Kesha is a Varsity Swimmer at Branham, Indian Classical Violinist, and a swim instructor at the YMCA!

Favorite Math Joke: Did you hear about the mathematician who's afraid of negative numbers? He'll stop at NOTHING to avoid them.

In five years I will be... Hopefully going to grad school and working part-time!

I love Mathnasium because... It not only gives me the opportunity to explore the world of math in both its roots and its complex branches, it provides me with the opportunity of communicating to students in a fun way that ultimately benefits them.



Rahul, Instructor

Rahul is a senior at Leland High School. Of course, one of his favorite subjects in school is math, but aside from that, he also loves his biology and literature classes. He is passionate about computer science and plans to pursue a career in the field in the future. In his free time, he likes to grab food with his friends, listen to music, and play Tetris!

Math Joke: Why should the number 288 never me mentioned? It's two gross!

Favorite Number: 6

I love Mathnasium because... it is a supportive learning environment that helps students learn math at a variety of levels while having fun.


Rhea, Instructor

Rhea is a senior at Leigh High School. Biology, Physics, and Calculus are her top three favorite subjects as they all fascinate her. In the future, she aspires to be a psychologist as she loves helping people out and meeting new people. She volunteers at Good Samaritan Hospital where she assists patients with their needs. In her spare time, she enjoys doing art, playing the piano, listening to music, and solving puzzles. 

Favorite Number: 0 (because it’s the only number that’s neither odd or even and is in the center of the number line)

Favorite Math Joke: 

Kid: “Dad, this room is so cold!”

Dad: “Go to the corner, it’s 90 degrees."

I love Mathnasium because it gives me the perfect platform to combine my two favorite things: math and teaching kids.