Who is A. R. Luria from The Man Who Mistook His Wife for a Hat and Other Clinical Tales and what is their importance?

A. R. Luria was a prominent neuropsychologist and author of the book, The Mind of Mnemonist. Like Hughlings Jackson, Luria is not an actual character in the book. Sacks references Luria's work repeatedly and often mentions that the two corresponded frequently. Luria conducted studies of twins and multiples and also worked extensively on aphasia research.