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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:

Roel Florentino, Owner, M.Ed.

Credentialed High School Math Teacher

Roel is a credentialed high school math teacher, currently in his 15th year of teaching. He received his Bachelor of Arts degree and Single Subject Teaching Credential in Mathematics from BIOLA University. He also holds a Master of Arts in Teaching Specialization in Educational Technology. Roel has a long history in education. He has over 20 years of combined tutoring and teaching experience. He was an AVID Peer tutor as a high school senior. He continued on for four more years as an AVID College Tutor to students in 9th - 12th grades, tutoring math. Roel's deep passion is playing a role in the academic success of each child in order for them to achieve their goals and dreams. Roel believes that education is the key to success in life. Mathnasium is the avenue in which Roel chose to provide that to young children. 

Favorite Number: 34

Favorite Math Joke: 3 out of 2 people have trouble with fractions.

In five years, I will be: 5 years older!

I love Mathnasium because: I love being able to change a child's life through the subject I am most passionate about.

Stephen Lane, Center Director

Stephen studied pure mathematics at Cal Poly SLO. He wants to finish his degree and obtain his teaching credentials in order to teach at the high school level. Math has always been Stephen's favorite subject, but he has also enjoyed computer science and philosophy. In his free time, he loves to play board games, collect Rubik's cubes and other puzzles, and play competitive Magic: the Gathering. 

Favorite Number: 36

Favorite Math Joke: If I were sin^2(x) and you were cos^2(x), together we would be one.

In five years, I will be: Teaching or working in a math related field.

I love Mathnasium because: Math is the one subject where you can sit down with a pencil and find something new. Formulas aren't invented; they're discovered. But I think math has a lot of valuable skills to offer outside of just formulas, and I want to share that.


Masaki Ogikubo, Instructor

Masaki recently transferred to the University of California Irvine from Irvine Valley College and is pursuing a Bachelor's degree in Electrical Engineering and Computer Science. He has over two years of experience in teaching math as a private tutor and as a soccer trainer. He is a passionate instructor who loves working with children to help them succeed. 

Favorite Number: 20

Favorite Math Joke: What do you call an angle which is adorable? An acute angle

In five years, I will be: I will have an electrical engineering degree from UCI and either working for a medical equipment related company or working with engineering mates to start up a company that makes useful devices. 

I love Mathnasium because: I enjoy teaching children. Working at Mathnasium allows me to inspire children thorugh tutoring. I love to support children in achieving their academic goals.


Cory Lumsdaine, Instructor

Cory recently graduated from the University of California, Irvine with a Bachelor's Degree in Public Health Sciences. He has been tutoring for over 5 years in mathematics and science. Cory plans to obtain a PhD and become a cancer epidemiologist and research professor. His hobbies include reading, hiking, and record collecting. 

Favorite Number: 25

Favorite Math Joke: It is a shame parallel lines never meet, because they have so much in common. 

In five years, I will be: working on my PhD in cancer epidemiology.

I love Mathnasium because: their curriculum and method for teaching mathematics works incredibily well. Instead of just tutoring a student; we are able to fill in the gaps and make them more confident in their math abilities. 


Elena Velarde, Instructor

Elena is a sophomore at Trabuco Hills High School where she’s taking Honors Math Analysis and Honors Chemistry. She has loved math since learning 2+2=4. Elena has spent several years helping family and friends with homework of all kinds. She enjoys solving puzzles, playing board games, and hiking. She hopes to eventually become a high school math or chemistry teacher. 

Favorite Number: 10

Favorite Math Joke: What did zero say to eight? Nice belt!

In five years, I will be: attending college, majoring in math, of course!

I love Mathnasium because: of its unique approach of teaching math to students of all ages and removing frustration from their learning experience.  I enjoy working with children and experiencing that a-ha moment when math finally clicks for them.


Ashley Dye, Instructor

Ashley graduated from Cal State Fullerton with a Bachelor’s Degree in Mathematics.  Although she originally wanted to pursue teaching, Ashley found she preferred the individual interaction with students in a tutoring environment.  She started private tutoring in high school, and hopes to continue to change students’ perspectives on math!  Ashley enjoys getting outside and spending time with her husband and family.

Favorite Number: 8

Favorite Math Joke: The derivative of my love for you is 0, because my love for you is constant.

In five years, I will be: Working in a math-related field.

I love Mathnasium because: I think every student has the capability to understand math, if it is explained in the way that makes the most sense to them.