No, individuals can succeed in varied fields despite their dyslexia. Examples include:

Ann Bancroft - First woman in history to cross the ice to both the North and South Poles.
Web site: http://www.yourexpedition.com

David Boies - Trial lawyer whose high-profile clients have included former U.S. Vice President Al Gore, Jr., Napster, and the U.S. Justice Dept. in its antitrust suit against Microsoft.

Erin Brokovich - Real-life heroine who exposed a cover-up by a major California utility that was contaminating the local water supply. Their actions had severe, even deadly consequences to the members of the community. With her help, the townspeople were awarded a $333 million settlement, the largest ever in a U.S. direct-action lawsuit. (Julia Roberts played her in the movie with the same name.)

Stephen J. Cannell - Author and Emmy Award-winning TV producer and writer, who has created or co-created more than 38 shows, of which he has scripted more than 350 episodes and produced or executive produced more than 1,500 episodes. His hits include "The Rockford Files," "A-Team," "21 Jump Street," "Wiseguy," "Renegade" and "Silk Stalkings."  Web site: http://www.cannell.com

Whoopi Goldberg - Actor and comedian, winner of an Academy Award for her supporting role in "Ghost," also an Academy Award nomination for her role in "The Color Purple."
Web site: http://www.whoopi.com