Dr Derek Enlander is an internationally recognized expert in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and Fibromyalgia. Born in Belfast, Northern Ireland, he became a fellow of Stanford University Medical School in the USA and later took up other prestigious positions including Physician-in-Waiting to the British Royal Family on their visits to New York, and it was here that he set up his private practice, in Manhattan.

His interest in ME/CFS began when a childhood friend in Ireland contracted the illness and asked him for help. He has been researching, treating and advocating for this illness ever since.

In 2011 he opened the ME/CFS Center at Mount Sinai School of Medicine (Mt. Sinai MEC), New York.