Do your lawyers only handle SJS cases?

SJS litigation is one of our core focuses. While our attorneys have broad trial backgrounds, a significant portion of our work is centered on building strong cases for people who have experienced the tragedy of SJS or TEN.

Will I work directly with a partner?

Yes, you will. We don’t let our clients get lost in layers of staff. A partner-level SJS lawyer guides every case, and they’re supported by a dedicated team that knows both the medical aspect and the law.

What makes your approach different from other firms?

Our SJS lawyers don’t just know the law—they work alongside leading medical specialists to interpret complex records, uncover missed diagnoses, and prove causation. That level of preparation is why other lawyers nationwide consult us on SJS cases. With a proven record against major pharmaceutical companies, we’ve shown we can meet their resources head-on and win justice.

SJS Lawyer | Dunn Sheehan LLP

Name: Dunn Sheehan LLP
Rating: 5

When Justice Demands Specialists

Not every lawyer is prepared for the intricate challenges of SJS litigation.

These cases demand uncommon knowledge and relentless preparation. At Dunn Sheehan, we’ve made SJS our core focus, and that focus has allowed us to help people affected by SJS get justice.

The Authority in SJS and TEN Litigation

Handling SJS Cases Nationwide

Our lawyers represented Stevens-Johnson syndrome clients on a daily basis. That experience means we often recognize details others miss and know how to use them in court.
The Highest Success
Record Nationwide

Results define reputation. No other firm has our results in SJS litigation.
Legal Strength Anchored
in Empathy

We fight like trial lawyers and listen like counselors. That balance—dedication and compassion—is what allows us to guide families through the toughest cases.

30+

states nationwide served as lead counsel

50+

SJS Victims Assisted

$100M+

Won in Settlements

See Our Results

View All Results

$30M Confidential Pharmaceutical Settlement
Multi-plaintiff pharmaceutical liability case resolved after more than four years of litigation.
$3M Confidential Pharmaceutical Settlement
Pharmaceutical drug reaction case involving severe burn injuries and lasting ocular damage.
$2.25M Confidential Pharmaceutical Settlement
Single-plaintiff case centered on ocular injuries caused by a pharmaceutical drug.

Connor G. Sheehan

Connor G. Sheehan devotes his entire practice to civil litigation, with a focus on pharmaceutical product liability, catastrophic injury, and wrongful death cases.

Since co-founding Dunn Sheehan in 2010, he has tried over 25 jury cases, served as lead counsel in cases in over 30 states, and recovered well over $100 million for clients. Recognized by Super Lawyers (2010–2025), Sheehan is a frequent author and lecturer on product liability, pharmaceutical and mass tort litigation, respected nationally for his results and thought leadership.

Robert Mosier

Robert Mosier is a trial lawyer with 30 years of experience representing plaintiffs in a diverse range of matters, including pharmaceutical, medical malpractice, birth and brain injury, patent and trademark infringement, eminent domain, hot air balloon crashes and deaths caused by big-rig trucks.

He has served as lead counsel, liaison counsel, and committee member counsel in national pharmaceutical litigations against the world’s largest pharmaceutical companies and has been a featured speaker at national legal conventions.

Mr. Mosier is an AV Preeminent Attorney, a member of the Million Dollar Advocates Forum, an Arizona Top Rated Attorney – Top Trial Lawyers in America, National Trial Lawyers – Top 100.

Mr. Mosier is licensed to practice law in California and Arizona, is admitted to practice before the Supreme Court of the United States of America, Ninth District Court of Appeal, District Court of Arizona, District Court of California – Central Southern, Eastern and Northern Districts, District Court of New York – Southern District, and the Eastern District Court of Pennsylvania.

Licensed and located in California

Holly Mosier

Ms. Mosier, a former actress, has practiced trial law since 1995. She graduated valedictorian, summa cum laude, from law school and clerked for Presiding Justice David Sills at the California Fourth District Court of Appeal. She began her career at a major California medical malpractice defense firm representing doctors and hospitals before opening her own firm in 1998 to represent plaintiffs in wrongful death, catastrophic personal injury, and medical malpractice cases.

She has secured numerous multi-million-dollar settlements and verdicts, including a $14 million settlement for a cyclist struck by a truck, $6.4 million in a premises liability case, $6 million for medical negligence involving an infant, $3 million against the U.S. for a birth injury, a $2.6 million verdict against the VA for delayed cancer diagnosis, and a $2.5 million record settlement with the Orange County Transit Authority.

Ms. Mosier is licensed in California and Arizona and is admitted to practice before the U.S. Supreme Court, the Ninth Circuit Court of Appeals, federal district courts in California and Arizona, and all state courts in both states. She is a member of the Million Dollar Advocates Forum and a former board member of the Orange County Trial Lawyers Association.

Licensed and located in California

Patrick K. Sheehan

With multiple awards and 48 years of civil trial experience, Patrick Sheehan has had significant experience in a broad range of complex cases. He earned his law degree from St. Mary’s School of Law in 1975, where he graduated first in his class.

For years, Patrick represented both plaintiffs and defendants and has tried multiple cases to jury verdict in both state and federal courts. He has tried jury cases lasting two weeks to four and a half months.

For the past nine years, his practice has focused solely on plaintiff side wrongful death and catastrophic personal injury, oil and gas, trust and estate, and business torts litigation.

Patrick has earned numerous professional achievements, recognitions and awards and is repeatedly named a Super Lawyer.

Beyond the Verdict

Injury is painful in so many ways, and working with the attorney's and staff at Dunn Sheehan was a HUGE blessing. The entire staff was always responsive, helpful, informative, and sensitive to…

Dawn B., California

Injury is painful in so many ways, and working with the attorney's and staff at Dunn Sheehan was a HUGE blessing. The entire staff was always responsive, helpful, informative, and sensitive to our family’s trauma. That demeanor helped us process the damage done and move forward to a brighter future. We are eternally grateful for the compassionate help you provided to our family. Having your representation made all the difference for us. Many thanks to everyone at Dunn Sheehan!

Dawn B., California
Finding the correct words to praise this firm is nearly impossible! Connor Sheehan (attorney) and awesome Michelle Yelle (litigation paralegal) are in a league of their own! They are professional yet sensitive.…

Jill G., Ohio

Finding the correct words to praise this firm is nearly impossible! Connor Sheehan (attorney) and awesome Michelle Yelle (litigation paralegal) are in a league of their own! They are professional yet sensitive. Their legal knowledge is beyond expectations! Their work ethic and expertise is an A+. As a team they worked incredibly hard and long hours and helped our daughter receive a secure financial future. Thank you from the bottom of our hearts!

Jill G., Ohio
I have NEVER been treated with such, compassion, dignity, respect, empathy, and all around kindness in my life. All of this and so much more from a group of people whom I…

Ashley F., California

I have NEVER been treated with such, compassion, dignity, respect, empathy, and all around kindness in my life. All of this and so much more from a group of people whom I never even met. I was going through the worst moment of my life, and I was having to relive it over and over, looking for help. I could not have found a better group to go through this experience with. I can honestly say they all have a special place in my heart, and I will never forget them or what they've done for my family. Everyone was amazing, but a special acknowledgement to Connor and Michelle.

Ashley F., California
Going through a lawsuit after the passing of my mother was an emotionally heavy journey, but the Dunn Sheehan Firm made it much more bearable. Connor and his team were immediately responsive,…

Lauren G., California

Going through a lawsuit after the passing of my mother was an emotionally heavy journey, but the Dunn Sheehan Firm made it much more bearable. Connor and his team were immediately responsive, genuinely caring, and treated us like family. Their sensitivity and professionalism were evident from the start, and we always felt secure and supported. Their commitment to our case and dedication to supporting our family during such a horrible time were truly remarkable. Their guidance and advice were invaluable, and the entire process was handled with the utmost respect and compassion. We are extremely satisfied with the outcome and the unwavering support we received. The Dunn Sheehan Firm provided us with much-needed reassurance and confidence during a very difficult time, and we couldn't be more grateful.

Lauren G., California
I can’t thank Connor, Michelle, and Linda enough for all the work they’ve done on my behalf. I feel so fortunate to have found them and had them in my corner litigating…

Anne M., Massachusetts

I can’t thank Connor, Michelle, and Linda enough for all the work they’ve done on my behalf. I feel so fortunate to have found them and had them in my corner litigating an extremely complex and challenging case against a large and well-resourced corporation. They were always responsive, easy to work with, and compassionate towards my condition and the limitations it placed on me in life. The award they were able to win has been integral to ensuring I have access to the needed care and maintain my quality of life in retirement.

Anne M., Massachusetts
After experiencing a life changing illness, our family was represented by Connor Sheehan in a lawsuit which resulted in a substantial award from the responsible party. And although the award could not…

Tom S., Arkansas

After experiencing a life changing illness, our family was represented by Connor Sheehan in a lawsuit which resulted in a substantial award from the responsible party. And although the award could not replace my wife’s arms and legs, it did provide the means to move on with her life without the financial burden of her loss. We will be forever grateful for the professionalism, thoroughness and caring that everyone representing us demonstrated.

Tom S., Arkansas

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