Having finished his apprenticeship with Hammond, Keats registered as a medical student at Guy's Hospital (now part of King's College London) and began studying there in October 1815. Within a month of starting, he was accepted as a dresser at the hospital, assisting surgeons during operations, the equivalent of a junior house surgeon today. It was a significant promotion, that marked a distinct aptitude for medicine; it brought greater responsibility and a heavier workload. Keats' long and expensive medical training with Hammond and at Guy's Hospital led his family to assume he would pursue a lifelong career in medicine, assuring financial security, and it seems that at this point Keats had a genuine desire to become a doctor. He lodged near the hospital, at 28 St Thomas's Street in Southwark, with other medical students, including Henry Stephens who became a famous inventor and ink magnate.