What if your middle school math teacher also happened to be one of the fastest marathoners in the world? That’s the story of Susanna Sullivan, an American distance runner who has quietly built a reputation as both an inspiring educator and a world-class athlete. Her journey blends discipline, resilience, and a touch of everyday relatability that makes her stand out in the running community.
From Classroom to Marathon Course
Susanna Sullivan was born in Florida in 1990 and grew up in Virginia, where she eventually became a middle school math teacher. While many elite athletes dedicate their entire lives to training, Sullivan has balanced lesson plans with long runs, proving that passion and persistence can coexist with a full-time career.
She ran for the University of Notre Dame before turning her focus to road racing.
In 2022, she placed sixth at the Chicago Marathon, a breakthrough moment that put her on the global radar.
By 2024, she clocked a personal best of 2:21:56 at the Chicago Marathon, ranking her among the fastest American women ever.
She has represented Team USA at the World Athletics Championships, finishing as high as fourth in 2025.
Her story resonates because it’s not just about medals—it’s about balance, grit, and showing up for both students and sport.
Why Susanna Sullivan Inspires Runners Everywhere
A Dual Identity: Teacher and Athlete
It’s rare to see someone excel in two demanding fields at once. Sullivan’s ability to teach math by day and train for marathons by night has earned her the nickname “America’s fastest teacher.”
Did You Know?
At the 2023 London Marathon, she finished in the top 10—while still grading papers and preparing lessons for her students back home.
Breaking Barriers in Women’s Running
Sullivan’s rise reflects a broader trend in American women’s distance running, where more athletes are breaking into the world’s elite ranks. Her performances in Chicago and London show that U.S. runners are closing the gap with East African dominance.
Common Questions About Susanna Sullivan
Q: What is Susanna Sullivan’s fastest marathon time?
A: Her personal best is 2:21:56, set at the 2024 Chicago Marathon.
Q: Has she competed internationally?
A: Yes, she has represented the United States at multiple World Championships, including a fourth-place finish in 2025.
Q: Does she still teach?A: Yes—her dual career as a teacher and runner is part of what makes her story so unique.
Lessons Beyond the Finish Line
Watching Sullivan’s career unfold makes me think about how we all juggle different roles in life. I’m not a marathoner, but I know what it feels like to chase big goals while balancing everyday responsibilities. Her story reminds me that consistency often matters more than perfection—and that sometimes, the best inspiration comes from people who live in two worlds at once.
The Legacy of Susanna Sullivan
Susanna Sullivan isn’t just a runner; she’s a symbol of perseverance and balance. Whether she’s leading a classroom or racing through the streets of Chicago, she shows that passion can thrive in unexpected places. Her journey proves that you don’t have to choose between career and calling—you can run with both.
What do you think—does her story make you want to lace up your shoes, or maybe just admire the quiet strength it takes to live two lives at once?