 In 1866, he took the position of physician to the skin department at Charing Cross Hospital and in 1868 he became the physician in charge of the dermatology department back at University College Hospital.In the 1870s, Henry Radcliffe Crocker came to the University College Hospital and worked under Fox in the dermatology department.At this time, the practice of specialising in medicine was frowned upon in the United Kingdom (although more popular in continental Europe), but Fox and Crocker were credited with bringing some structure to the field of dermatology.