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I am a workers’ compensation and serious injury attorney with over 35 years of experience advocating for injured individuals in Missouri and Illinois. Before becoming an attorney, I was a Registered Nurse — and that medical foundation continues to shape how I practice law today.
My career began representing insurance companies and employers. That experience gave me an inside understanding of how claims are evaluated, defended, and often minimized. Today, I use that knowledge to advocate exclusively for injured workers and accident victims.
As a nurse-turned-lawyer, I approach every case with both clinical insight and legal precision. I understand medical records, impairment ratings, causation issues, and the long-term impact injuries have on a person’s ability to work and live fully. This dual background allows me to identify strengths in a case that others may overlook.
My practice focuses primarily on:
• Missouri and Illinois Workers’ Compensation
• Permanent Total Disability claims
• Complex and medically intensive cases
• Serious personal injury matters
I lead a focused, all-female firm committed to compassionate, highly strategic representation. My clients are never treated as files or numbers. Injury cases are deeply personal — they affect income, identity, family stability, and peace of mind. I take that responsibility seriously.
I believe strong advocacy requires both strength and empathy. As a nurse, I cared for patients. As an attorney, I fight for them.
3
Practice Areas
35 years | 25,000 cases
35 years | 5,000 cases
35 years | 200 cases
Free Consultation
$0 first 15 minutes
25%-35%
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Chat withState: Colorado
Acquired: 2003
No misconduct found
State: Illinois
Acquired: 1992
No misconduct found
State: Missouri
Acquired: 1991
No misconduct found
425 North New Ballas Road, Saint Louis, MO, 63141
24 Client Reviews
Showing 1 - 5 of 6 reviews | Compassion
Posted by Elizabeth | February 25, 2026 | Hired Attorney | Workers Compensation
Expert Guidance Through a Complex Workers’ Comp Case
Cynthia Hennessey provided exceptional representation during one of the most difficult periods of my life. Her knowledge and experience in workers’ compensation law were evident from our first conversation. My case was medically and legally complex, yet she navigated every detail with confidence, pre...
Posted by David | February 23, 2026 | Hired Attorney | Workers Compensation
Accomplished and Caring Attorney
Cynthia Hennessey successfully represented me “long distance” with a workmen’s compensation claim several years ago after I suffered a traumatic brain injury from a fall while at work. I give her my highest recommendation. She is a caring, knowledgeable, accomplished and very successful attorney. ...
Posted by Howard | March 11, 2012 | Lawsuits & Disputes
Very Good Experience
Cynthia was truly an angel to me when I needed it the most. After having 2 other lawyers take my case and do nothing for 5 years, I prayed to find an honest lawyer who would take it and work it and finally get me justice. Cynthia handled my case, worked very hard and I am very grateful.
Posted by beth | February 08, 2012 | Workers Compensation
Highly recommend for brain injury
My husband worked for a very large company, (I can’t say who) that delivers packages worldwide. He fell off a loading dock 2 years ago, onto his back and head. He suffered an injury to his head and brain and has never returned to work and will never return to work. He has never been the same since...
Posted by Bill | January 25, 2012 | Car Accidents
Excellent Lawyer for Auto Accident Case
Cynthia Hennessey handled my daughter’s car accident case. I was very nervous hiring a lawyer for her as she is only 18. I knew she needed a lawyer and would not be treated fairly by the insurance company. I admit I liked that Cynthia is a nurse and a woman. I thought she would be more understandin...
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2019
Client Champion Award, Martindale-Hubbell
1997 - Present
Attorney, Hennessy Law firm, LLC
1990 - 1997
Attorney, Evans & Dixon, LLC
Member
Member
Member
Permanent Total Disability Award Secured – Lifetime Benefits Granted (ALJ Reversed)
1991
JD - Juris Doctor
1985
BA - Bachelor of Arts
N/A
Missouri and Illinois Workers' Compensation
2026
2025
2025
2025
English