David began teaching memory techniques in 1997 in the Fire Service and soon moved on to schools, Universities, associations and companies.
In 1999, he left the Fire Service to become a full time professional speaker.
To date, he has spoken to more than 500,000 people in 25 countries.
Venues include The Tower of London, Wembley and Caesars Palace.
In 2003, he began speaking for CEO mentoring groups and has spoken to over 2000 MDs and CEOs. One of the groups, the Academy for Chief Executives, awarded him their highest accolade - Speaker Hall of Fame.