John Michael Newsom-Davis CBE FRS FRCP FMedSci (18 October 1932 – 24 August 2007) was a neurologist who played an important role in the discovery of the causes of, and treatments for, Myasthenia gravis, and of other diseases of the nerve-muscle junction, notably Lambert–Eaton myasthenic syndrome and acquired neuromyotonia.

During his two years national service in the RAF (1951–53), he qualified for full pilot training, and learned to fly Meteor jet fighters.

[5] At Oxford not only did he build up clinical neuroscience in his own field of immune-mediated and genetic diseases, he also established a Centre for the Functional Magnetic Resonance Imaging of the Brain,[6] which was recognised as a world leader.

[3] After his "retirement" from Oxford in 1998, he continued to edit Brain until 2004 and to hold a weekly myasthenia clinic, as well as honouring many invitations to lecture abroad.

He also took on the huge task, together with the National Institutes of Health in the United States, of organising and funding a multi-centre trial (over 80 centres) to determine whether thymectomy is an appropriate treatment for myasthenia gravis.