Pamela Thomas-Graham raised CNBC’s prime-time profile last year with the premiere of “Topic A With Tina Brown” and the development of upcoming talk shows for Dennis Miller and John McEnroe. She also oversaw the creation of two original documentaries dealing with the WorldCom debacle and the AOL Time Warner merger. The network made waves when it co-hosted a Democratic presidential debate, the first one attended by Gen. Wesley Clark. And its ratings reflected an 11 percent increase in its key demographic, adults 25 to 54. Ms. Thomas-Graham, who writes Ivy League-set crime novels in her spare time, capped the year by being named to the board of CNBC International in December.