Dominic O’Brien is a British mnemonist and an author of memory-related books. He is the eight time World Memory Champion. In 1987, at the age of 13, he began developing his own mnemonic techniques. He became the world record holder for the first time on April 30, 1988. Then he memorized six mutually mixed stacks of 52 sheets. Two years later, the number of decks increased to 35 (1820 cards), in 1993 – to 40, and in 2002 – to 54 (2808 cards), almost flawlessly had broken all records.
Samvel Garibyan is a Russian businessman, author of memory-related books, and became a Guinness world record holder twice. His first record included the memorization and reproduction of thousands of words. The words were presented in 10 different languages – English, German, Urdu, Dari, Pashto, Farsi, Arabic, Bengali, Spanish and Esperanto. Out of 1000 words, he successfully translated and reproduced 960. For the second time, Garibyan memorized 2 thousand words in Russian. During their reproduction, he made mistakes 32 times and used hints more than a hundred times, which provided for choosing the right word from 3-4.