He also received the title of international grandmaster of memory , the highest title bestowed by the World Memory Sports Council , at this event .
Mullen became the tenth individual , and the first American , to win the world championship since its inception in 1991 .
Mullen also received the title of international grandmaster of memory , the highest title bestowed by the World Memory Sports Council , at this event .
Mullen became the tenth individual , and the first American , to win the world championship since its inception in 1991 .