Answer:
The leading judge in the case of Donoghue v Stevenson was Lord Atkin. In his famous judgment, Lord Atkin established the foundational legal principle of negligence known as the "neighbour principle." This principle holds that individuals owe a duty of care to those who are closely and directly affected by their actions or omissions, essentially stating that "you must take reasonable care to avoid acts or omissions which you can reasonably foresee would be likely to injure your neighbour." This case is significant in the development of modern tort law and the concept of duty of care.