The news about the first "child from three parents" in the history of mankind gave an opportunity to talk about Ley's syndrome, a disease, which until now, perhaps, was heard only by those whose family was affected by such a tragedy. From now on, this incurable disease, caused by mutations in mitochondrial DNA, can certainly not be cured but prevented. However, the name of the person who described the pathology remains unknown. We will try to write at least a few words about this outstanding person, who is much more famous in psychiatry, although he started out as a neurosurgeon. The biography of this man is accompanied by a lot of abbreviations, which the British have fallen so hard on. This is what his biography looks like in three lines: MB ChB Manch(1939) BSc(1939) MRCP(1941) MD(1947) FRCP(1955) FRCPsych(1971) Let's decipher this "secret writing" step by step. Archibald Denis Ley was born on October 11, 1915. The father of the future psychiatrist worked as a manager at the Lancashi