Samuel Johnson LL.D. MA (September 18 1709 – 13 December 1784), often referred to simply as Dr Johnson, is one of England’s best known literary figures, an essayist, biographer, lexicographer and a critic of English Literature. He was also a great wit and prose stylist, well known for his aphorisms. Johnson had poor eyesight, was hard of hearing and had a scarred face as a result of childhood scrofula. He also had a number of tics and other involuntary movements, the symptoms described by Boswell suggest that Johnson had Tourette syndrome and obsessive-compulsive disorder.