GLeaM, Girls Leading through Mathematics, seeks to empower girls through the creative, logical and limitless art of mathematics.

Follow GLeaM on Instagram: @gleammath!

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Left: Watch our video promo from Nov 2019!

Below: A rendering of the Mandelbrot set, an example of a fractal, a never-ending, complex pattern that repeats at various scales, often resulting from relatively simple equations

Our Mission

To inspire girls through the beauty of mathematics, giving them the confidence to pursue STEM careers

To provide the resources needed to ignite a passion for analytical, creative thought and to excel in local math competitions

To build a positive, passionate community around mathematics


GLeaM's founder, Catherine Cossaboom, a senior in high school, is the sole leader of all events, articles, and curricula through this program. She has been extremely passionate about math from an early age. She is a member of Georgia's state math team, Georgia ARML, an alum of the prestigious MathPrize for Girls competition at MIT, and a successful participant in the MathCounts and MAA competitions. She is a three-year captain of her high school's math team, leading her team to straight 5A state championships. She attended Georgia's Governor's Honors Program (GHP) in 2019 as a math major and the prestigious Ross summer program for number theory in 2020. She is also a problem writer for the worldwide organization inteGIRLS.

GLeaM focuses on exciting areas of more discrete fields of math not taught in schools, such as number theory and combinatorics, as well as prep for middle and high school math competitions, such as AMC and MathCounts, to encourage members to discover the value in creative problem-solving.

Catherine sees math as empowering and beautiful, and she loves to share that passion with members of GLeaM.

Note: Although this site is geared towards girls and the majority of members are girls, everybody, including boys, is allowed to join GLeaM as long as they are respectful and support the community, and we welcome all members!


GLeaM's website guides members through a variety of resources, including competition-related websites,

 listings of opportunities around Atlanta (and the nation!) and links to exciting topics in various fields of math. This creates an immersive experience for members and helps them to grow their knowledge and passion for STEM fields.

Image: The work of Dutch mathematical artist, M. C. Escher


Every other week, an article is uploaded about fascinating fields of math, as well as tips as to how to improve your math game, including prep for local and national competitions.

A friendly server accessible for comments allows us to discuss the material and provide enrichment and puzzles for all types of puzzle lovers.

You can expect a new post by each Sunday at 5 pm.

Image: A closeup of a succulent plant, revealing ratios related to the Fibonacci sequence and the Golden ratio


Each member of the GLeaM community has access to the forum, where they can post ideas, questions, stories... anything they want to discuss with the community. In this way, we can also gather feedback to better curb the program to our members and their interests.

You can sign up to become a member in the top righthand corner.


Image: A fractal, the Sierpinski triangle, revealed by coloring in the even and odd numbers differently on Pascal's triangle


Occasional scheduled events will occur, where we can delve further into an area of interest or into prep for MathCounts if so desired. They will either occur through Zoom or in a venue around Atlanta. The event information will be posted well in advance to the forum.

Members are also always welcome to contact the founder for any advice.

Image: A portion of another fractal, the Julia set


The great mathematician Maryam Mirzakhani's family often described her work as "painting," as she crouched on the floor drawing on large sheets of paper. Mirzakhani was the first woman to win the Fields Medal, a prestigious award that is often equated with the Nobel Prize for math. She was a major advocate for women in mathematics, and she died in 2017 of breast cancer. The paintbrush is a symbol of Mirzakhani, but also of the beauty of mathematics, closely intertwined with art in the way ideas transition marvelously into one another. Around the paintbrush is a fractal, the Sierpinski triangle, one of the most beautiful aspects of math, reminding us to pursue seemingly impossible dreams in surprising fractional dimensions. 

“Pure mathematics is, in its way, the poetry of logical ideas.”

Albert Einstein


Right: Another work of M. C. Escher, entitled "The Waterfall"

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