Who is Dr. Cable from Uglies and what is their importance?

Dr. Cable is one of the leaders of Special Circumstances. Dr. Cable contacts Tally on her birthday and asks her to help them find the Smoke with the instructions that Shay left for Tally. When Tally refuses, Dr. Cable threatens to leave her an ugly for all her life. After making a promise to her friend Peris, Tally agrees to Dr. Cable's plan to go to the Smoke and to set off a secret locator to alert Special Circumstances to the location.