1) Expert 
The title mnemonist (derived from the term mnemonic) refers to an individual with the ability to remember and recall unusually long lists of data, such as unfamiliar names, lists of numbers, entries in books, etc. Mnemonists may have superior innate ability to recall or remember,{fact|date=August 2014} or may use techniques such as the Method of l...
one from whose memory nothing is erased
A person who has learned techniques that enable extraordinary feats of memory.
A person who has learned techniques that enable extraordinary feats of memory.
[n] - an expert in the use of mnemonics
mnemonist 1. One versed in the science of mnemonics; one who teaches how to train and improve the memory, or practices the art of memory. 2. A professional entertainer who practises recollection.
noun an expert in the use of mnemonics; someone able to perform unusual feats of memory