mnemonist
/nɪˈmɒnɪst/ (nim-uh-nist)
Definitions
1. noun
A person who uses memory aids or techniques to improve their ability to remember and recall information.
“The mnemonist used visualization techniques to remember the order of the cards in the deck.”
2. noun
A person who specializes in the study of memory and memory improvement techniques.
“The psychologist studied the techniques of a professional mnemonist to improve his own memory.”