Whether separately acting medical providers may be jointly and severally liable when their negligent acts contribute to one indivisible injury but the evidence does not permit an allocation of the injury between them.
Holding
Yes. A defendant whose negligence substantially contributed to a single, indivisible injury may be held jointly and severally liable even though the defendant did not act in concert with, or at precisely the same time as, the other negligent actor.
Reasoning
The ordinary rule distinguishes joint tortfeasors, who act in concert or concurrently to cause one injury, from successive and independent tortfeasors. A later, independent tortfeasor ordinarily answers only for a distinct injury or for the aggravation attributable to that tortfeasor's conduct. But that distinction does not control where the harm itself cannot reasonably or practicably be divided among the negligent actors.
New York precedent recognizes that separate negligence can support joint and several liability when it produces a single inseparable injury. In Slater v. Mersereau, separately negligent contractors were each liable for water damage that could not be traced to a particular source. In Hawkes v. Goll, drivers who struck a pedestrian in sequence could be jointly and severally liable because the evidence could not distinguish the injuries caused by the first collision from those caused by the second.
Josephine's brain damage was one indivisible injury. The medical testimony identified several possible contributing causes associated with both doctors' negligence, but no witness could say with certainty which factors caused what part of the damage or assign a percentage of the injury to Harris. Harris likewise offered no evidence allowing the jury to isolate a separate, measurable injury caused by his treatment.
The Court emphasized that difficulty in separating harm will not automatically make every later tortfeasor jointly and severally liable. Here, however, the proof established both that Harris's negligence substantially contributed to the brain injury and that the injury could not be apportioned. On those facts, joint and several liability properly protected the injured plaintiff's right to full recovery.