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William O'Brien

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Phone: (847) 835-8895

225 W Wacker Dr
Chicago, Illinois 60606

William O'Brien graduated from the University of Illinois Urbana-Champaign in 2009 with a Bachelor of Arts degree. While attending college, he studied history and political science. He also immersed himself in the local area and took part in many campaigns for community empowerment and social justice. For instance, he led a non-partisan voter registration drive in 2008 and a ballot reformation initiative in 2010.

He enrolled in law school at Chicago-Kent College of Law Illinois Institute of Technology in 2011. He focused on litigation and matters affecting consumers especially in their financial capacity. He graduated in 2014 with a Juris Doctorate degree. Then, he went on to receive his Masters of Law degree from Duke Law School in 2015.

William remains focused on protecting consumers, accident victims, and other vulnerable sections of society. His practice has focused on both regulatory as well as legal processes. He has developed modern techniques to examine case circumstances and move case strategy forward. He is committing to fighting for his clients and making sure they get the best outcome possible.

William assists the firm in the prosecution of serious accident and wrongful death cases such as: trucking accidents, workers compensation, construction site accidents and nursing home abuse.


LL.M., Duke Law School, 2015

J.D., Chicago-Kent College of Law Illinois Institute of Technology, 2014

B.A., Illinois Urbana-Champaign, 2009

Client Reviews
Jonathan Rosenfeld was professionally objective, timely, and knowledgeable. Also, his advice was extremely effective regarding my case. In addition, Jonathan was understanding and patient pertaining to any of my questions or concerns. I was very happy with the end result and I highly recommend Jonathan Rosenfeld. Michonne Proulx
Extremely impressed with this law firm. They took control of a bad motorcycle crash that left my uncle seriously injured. Without any guarantee of a financial recovery, they went out and hired accident investigators and engineers to help prove how the accident happened. I am grateful that they worked on a contingency fee basis as there was no way we could have paid for these services on our own. Ethan Armstrong
This lawyer really helped me get compensation for my motorcycle accident case. I know there is no way that I could have gotten anywhere near the amount that Mr. Rosenfeld was able to get to settle my case. Thank you. Daniel Kaim
Jonathan helped my family heal and get compensation after our child was suffered a life threatening injury at daycare. He was sympathetic and in constant contact with us letting us know all he knew every step of the way. We were so blessed to find Jonathan! Giulia
Jonathan did a great job helping my family navigate through a lengthy lawsuit involving my grandmother's death in a nursing home. Through every step of the case, Jonathan kept my family informed of the progression of the case. Although our case eventually settled at a mediation, I really was impressed at how well prepared Jonathan was to take the case to trial. Lisa