Sir Roger Bannister
Middle-distance runner and neurologist; first man to run a mile in under four minutes
there was already an area of research, the autonomic nervous system, which was relatively neglected. It was between cardiology and neurology, and these areas in between are often the province of neither specialty, and so can lag behind. And that was the area I chose and this changed the second half of my life, if you like, because I then set up a laboratory.