Late in life, Harvey told Boyle that it was the position of the valves of the veins that induced him to think of a circulation.
Harvey returned to England trained by the best anatomist of his day.

In London, he became attached to the College of Physicans, and taking his degree at Cambridge, he began the practice of medicine.

He was elected a fellow of the college in 1607 and physician to St.Bartholomew's Hospital in 1609.

In 1615 he was appointed Lumleian lecturer to the College of Physicians, and his duties were to hold certain "public anatomies," as they were called, or lectures.

We know little or nothing of what Harvey had been doing other than his routine work in the care of the patients at St.Bartholomew's.