John Haslam

Born in London in 1764, John Haslam trained in medicine and went on to serve as apothecary at Bethlem Hospital, the famous institution often called Bedlam. Working there gave him close, daily experience with patients suffering from mental illness, and that practical observation became the foundation of his writing.

He is especially remembered for Illustrations of Madness (1810), his account of James Tilly Matthews, a Bethlem patient whose elaborate persecutory beliefs were recorded in striking detail. The book is often noted as an early full-length psychiatric case study, and Haslam is also known for Observations on Insanity and other medical writing on the treatment and understanding of mental disorder.

Haslam died in 1844, but his books still matter to readers interested in the history of psychiatry. They capture a moment when medicine was beginning to move toward fuller clinical descriptions of the mind, even if many ideas and practices of the period now feel distant or troubling.