Catherine "Cat" Renar fought fires on the front lines in Chicago, and was usually surrounded by men.
She wrote "Chicago Strong: The Real Women of Chicago Fire." It's about what it was like to be a woman on the male-dominated fire force and recognizing the unique and diverse qualities that make female firefighters strong.
Renar also wanted girls and women to discover their own strengths and passions.
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The book took eight years to write, during which Renar was diagnosed with Parkinson's disease.
The Chicago fire commissioner is currently a woman, Annette Nance-Holt.
Visit www.facebook.com/RealWomenofChicagoFire for more information.