Kellie L. Mazzarella
Kellie L. Mazzarella
Partner
She/Her
"As a litigator, I present clear and concise arguments aimed at securing the best possible outcomes for my clients."

Kellie L. Mazzarella
Partner
She/Her
"As a litigator, I present clear and concise arguments aimed at securing the best possible outcomes for my clients."
About Kellie
A trial lawyer, Kellie represents clients in personal injury and property damage claims. She also defends hospitals, physicians, and healthcare institutions in professional liability lawsuits. Kellie handles all stages of litigation and is licensed to practice in Florida, Illinois, and Indiana.
During law school, Kellie served as a judicial extern for the Honorable William Bauer, United States Court of Appeals for the Seventh Circuit, and the Honorable Sharon Johnson Coleman, United States District Court for the Northern District of Illinois.
Areas of Focus
Industries:
Services:
Experience
- Secured a not-guilty verdict after a two-week trial in DuPage County, with the jury deliberating for just over one hour. The plaintiff alleged that an emergency room physician misdiagnosed him with a hypertensive emergency, leading to the administration of Nitroprusside, a potent vasodilator. The plaintiff claimed the medication caused a 67-point drop in blood pressure, ultimately resulting in a massive stroke 18 hours later. Successfully demonstrated the physician's adherence to the standard of care and the complexities of the plaintiff's medical condition.
Recognition
- The Best Lawyers: Ones to Watch™, Medical Malpractice Law – Defendants, 2021 – 2026; and Personal Injury Litigation – Defendants, 2021 – 2026
- Chicago Daily Law Bulletin and Chicago Lawyer Magazine, 40 Under Forty – Illinois Lawyers to Watch, 2024
- Illinois Super Lawyers, Rising Star, 2021 – 2024
- The John Marshall Law School (now known as the University of Illinois Chicago School of Law), CALI Award, Labor Law; Dean's List; Top 7% of class; Distinguished Scholar
Credentials
Education
- University of Illinois Chicago School of Law (formerly The John Marshall Law School), JD, with honors, 2014
- University of Iowa, BS, with honors, 2010
Bar Admissions
- Florida
- Illinois
- Indiana
Court Admissions
- US District Court for the Northern District of Illinois
- US District Court for the Northern District of Indiana
Thought Leadership
Presentations
- Co-Presenter, "The HITECH Act Unencrypted: An Overview of the HITECH: An Overview of the HITECH Act and its Impact on the Receipt, Transmission, Creation, and Maintenance of Protected Health Information," Fall Education Conference, Illinois Paralegal Association, Virtual Event, November 5, 2020
Press Releases
- 102 Hinshaw Lawyers Recognized in 2026 Editions of The Best Lawyers in America® and Ones to Watch™, Aug 21, 2025
- Hinshaw Partner Kellie Mazzarella Named to Chicago Daily Law Bulletin 2024 40 Attorneys Under Forty, Sep 18, 2024
- 105 Hinshaw Lawyers Recognized in 2025 Editions of Best Lawyers in America and Ones to Watch, Aug 15, 2024
- 101 Hinshaw Lawyers Recognized in 2024 Editions of Best Lawyers in America and Ones to Watch, Aug 17, 2023
- Eighty-Seven Hinshaw Lawyers Recognized in 2023 Editions of Best Lawyers in America and Ones to Watch, Aug 18, 2022
Webinar
Interests
Did you know...
Outside of client work, Kellie enjoys listening to classical piano music.
Thought Leadership
Presentations
- Co-Presenter, "The HITECH Act Unencrypted: An Overview of the HITECH: An Overview of the HITECH Act and its Impact on the Receipt, Transmission, Creation, and Maintenance of Protected Health Information," Fall Education Conference, Illinois Paralegal Association, Virtual Event, November 5, 2020
Press Releases
- 102 Hinshaw Lawyers Recognized in 2026 Editions of The Best Lawyers in America® and Ones to Watch™, Aug 21, 2025
- Hinshaw Partner Kellie Mazzarella Named to Chicago Daily Law Bulletin 2024 40 Attorneys Under Forty, Sep 18, 2024
- 105 Hinshaw Lawyers Recognized in 2025 Editions of Best Lawyers in America and Ones to Watch, Aug 15, 2024
- 101 Hinshaw Lawyers Recognized in 2024 Editions of Best Lawyers in America and Ones to Watch, Aug 17, 2023
- Eighty-Seven Hinshaw Lawyers Recognized in 2023 Editions of Best Lawyers in America and Ones to Watch, Aug 18, 2022
Webinar
Kellie's Insights

Press Release
Aug 21, 2025
102 Hinshaw Lawyers Recognized in 2026 Editions of The Best Lawyers in America® and Ones to Watch™

Press Release
Sep 18, 2024
Hinshaw Partner Kellie Mazzarella Named to Chicago Daily Law Bulletin 2024 40 Attorneys Under Forty

Press Release
Aug 15, 2024
105 Hinshaw Lawyers Recognized in 2025 Editions of Best Lawyers in America and Ones to Watch

Press Release
Aug 17, 2023
101 Hinshaw Lawyers Recognized in 2024 Editions of Best Lawyers in America and Ones to Watch

Press Release
Jan 3, 2022
Hinshaw Announces Election of 15 New Partners In Ten U.S. Offices

Press Release
Aug 19, 2021
Sixty-Seven Hinshaw Lawyers Recognized in 2022 Edition of Best Lawyers