Professor Williams has had a long interest in Sleep Medicine dating back to research into the sudden infant death syndrome conducted at Harvard University.  Subsequently he was appointed at UCLA and developed what was to become the largest sleep service within the Veterans Administration while at the same time co-directing the UCLA Sleep Disorders Centre. 

As sleep medicine gelled as a specialty, Professor Williams was one of the first to take the Board exams in 1989 to become an accredited polysomnographer and later member of the American Academy of Sleep Medicine.


In 1994 he returned to London where he established the Sleep Disorders Centre at Guy’s and St. Thomas’ NHS Foundation Trust, now by far the largest and most active in the UK, where he conitnues as a Consultant Physician, in addition to his similar role at Queen Victoria Hospital. His main interests now lie in the hidden consequences of Sleep Apnea and the genetics of sleep disorders.


Professor Williams has published widely in the field, is a Diplomat of the American Board of Sleep Medicine, European Somnologist (Certified by the European Sleep Research Society), a founding member of the Sleep Medicine Section of the Royal Society of Medicine and hold’s the UK’s first Chair in Sleep Medicine at Kings College, London, UK.