Attorney Mark Atlee began his legal career at a large firm in New York City, representing academic medical centers and hospitals in medical malpractice matters, like Cornell and Columbia Presbyterian Hospitals, Lenox Hill Hospital, and Memorial Sloan-Kettering Cancer Center. This experience provided Mark with insight into how hospitals and insurance companies investigate, defend, and value medical malpractice and personal injury cases. Mark worked with some of the nation’s leading physicians and surgeons, drawing on their expertise to explain complex medical concepts and understand procedures and operations. He was in court daily, learning from some of the most talented trial lawyers in New York City.
Mark returned to the firm his father founded, ready to serve the community where he grew up. His father was one of the most influential mentors in Mark’s life, and Mark learned from him at the dinner table, in the car, and in his office, listening and learning the ins and outs of the cases Atlee Hall handles today. Mark continues to hold the same values his father held when he started this law firm, values that the firm still upholds after nearly half a century. Atlee Hall is committed to their clients and the community at large, which has allowed its team to be nationally recognized while staying locally focused. The lawyers at Atlee Hall leverage their reputation and connections to bring leading medical experts from across the country, combining their expertise with the law firm’s personal, hands-on attention to fight for their clients’ rights.
What Clients Can Expect:
Every client who walks through Atlee Hall’s doors has already been through something no one should have to endure: a loved one lost, a life changed in an instant, a diagnosis that should have been caught. We never lose sight of that. Before the team even turns to discuss legal strategy, we sit with our clients and truly listen, to their fear, their anger, their grief, and the quiet, everyday struggles that come with rebuilding a life that someone else’s negligence upended. We start building a relationship on trust, patience, and genuine care. It is the foundation of everything we do. We tell our clients that we will worry about their case so they can focus on healing. Carrying that burden for them, so they don’t have to carry it alone, is why we do this work.
One thing we hear from almost every client is that while they’re concerned about themselves or their loved one, they don’t want anyone else to suffer a similar situation. We take that seriously, both as a commitment to our individual clients and to making our community safer. That directs us in our fight for their rights and recovery.
What distinguishes us is the depth of work we put into every case, and the fact that when someone hires our firm, they gain an entire team. From day one, our attorneys, in-house medical staff, and paralegals work through every record and provider, evaluating every deviation from the standard of care, together, throughout the life of the case.
We bring in leading medical and engineering experts, test cases through focus groups, and push for novel strategies using cutting-edge technology. In one case involving a recalled cardiac device tied to a nationwide infection cluster, we opted out of the class action to represent each client individually across six states, coordinating with co-counsel and world-renowned experts to get them the justice they deserved.
We also invest heavily in presentation. For a client with vision loss, we worked with Wills Eye Institute and Duke to build 3D goggles that let a mediator experience that loss firsthand. We find ways to ensure that our clients’ stories are never left untold.
Notable Case Work
- Case: Delayed Diagnosis and Treatment of Neonatal Herpes Simplex Virus (HSV) Infection
- Result: Confidential Settlement
- Despite his mother’s known HSV history and a persistent rash, our client wasn’t tested for HSV until the infection had progressed to meningoencephalitis, causing seizures and permanent brain injury. Working with pediatric infectious disease, neurology, neuroradiology, and nursing experts, we pursued the providers who missed the warning signs. The case resulted in a settlement to fund his lifetime of care.
- Case: Failure to Timely Diagnose and Treat Cauda Equina Syndrome Following Spine Surgery
- Result: Successfully Arbitrated the Case and Received a Verdict in Our Client’s Favor
- Our client developed classic warning signs of cauda equina syndrome after spine surgery, but her surgeon dismissed her worsening symptoms and chose observation over emergency decompression. She now lives with permanent bowel and bladder dysfunction, chronic pain, and loss of sensation. With spine surgery, neuroradiology, and life care planning experts, we proved earlier action would have changed her outcome.
- Case: Product Liability — Cardiac Bypass Heater-Cooler Device (NTM Infection) Litigation
- Result: Significant Confidential Settlements on Behalf of Multiple Clients
- We represented patients nationwide who developed serious NTM infections after cardiac surgery, traced to a recalled heater-cooler device. Rather than join a class action, we litigated each case individually across six states, requiring international discovery and depositions in the UK, France, and Canada. Every case was ultimately resolved successfully.
- Case: Wrongful Death — Defective Imported Artificial Christmas Tree Fire
- Result: Confidential Settlement
- We partnered with co-counsel to represent three children orphaned when a defective imported artificial Christmas tree caught fire, killing both parents and two siblings. Using fire cause and origin, engineering, and reconstruction experts, we established the cause of the fire and held the defendants accountable. The result brought justice to the surviving children and helped prevent similar products from reaching the market.
- Case: Wrongful Death — Railroad Pedestrian Crossing Safety
- Result: Confidential Settlement Amount; Close Hazardous Crossing
- We represented the family of a teenager killed by a train at a pedestrian crossing lacking adequate safety measures. Navigating complex federal preemption issues, we coordinated experts in accident reconstruction, human factors, and audiology to prove the crossing was dangerously deficient. The litigation led to the crossing’s permanent closure and replacement with a pedestrian overpass.
- Case: Wrongful Death — Fatigued Commercial Truck Driver / Trucking Company Negligence
- Result: Confidential Settlement
- Our client was killed instantly when a fatigued truck driver struck her vehicle at 50 mph without braking. Though the trucking company initially claimed only $1 million in coverage, our investigation uncovered the driver’s improper medical clearance and a pattern of fatigue-inducing scheduling tied to a much larger corporate entity. This allowed us to pursue claims well beyond the initial policy limits and hold the systemic practices accountable.
Mark’s Practice Areas:
Professional organizations
- Lancaster Bar Association
- Pennsylvania Bar Association
- SuperLawyers, 2026
- BestLawyers, 2027
- Pennsylvania Association for Justice, Board of Governors
- American Association for Justice
- Attorneys Information Exchange Group
Pro Bono Work
Over the course of his career, Mark has engaged in pro bono work. Mark has represented clients in work-related discrimination claims arising out of their religious beliefs. He has lectured on Medical Malpractice and Trial Advocacy at PBI continuing legal education seminars. He also served on the Board of The Stone Independent School during its inception and founding.
Education, Licensure, and Lifestyle
Mark earned his law degree from New York Law School, magna cum laude. His passion for law came from his father, William Atlee, Founding Partner of Atlee Hall. He is licensed to practice law in both Pennsylvania and New York.
