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Mine is Michelle Singletary who writes for the Washington Post. She also has a few books out and her column is in other newspapers as well.
I used to listen to Clark Howard's radio show but haven't been able to lately.
On investing: Larry Swedroe, William Bernstein, Burton Malkiel, John Bogle
On personal finance: Jason Zweig, Jane Bryant Quinn, Mary Hunt, Dave Ramsey (with some reservations)
On market history: Peter L. Bernstein
Avoid at all costs: Robert Kiyosaki, Kevin Trudeau
Ben Stein is sometimes good, but very inconsistent. Sometimes his advice is awful. Dave Ramsey does a huge amount of good with his personal finance advice, but his investing advice sucks eggs. Kiyosaki and Trudeau are just scammers, IMO.
Andrew Tobias - Read "The Only Investment Guide You'll Ever Need"
Ric Edelman - All his books, especially "The Truth About Money" are very good.
Suze Orman is generally good too.
As Mike W. mentioned, avoid:
Kiyosaki - He's made a lot of money by writing dozens of books on personal finance without offering specifics guidelines. He was exposed on 20/20 for this and if you look him up on John T. Reed.com you'll find an in-depth explanation of why you shouldn't listen to him.
Also avoid Dave Ramsey and David Bach -- neither one understands mortgage financing.
Michael Lewis, otherwise I go by books over authors.
The Snowball is pretty good, I've read the other biography on Buffett by lowenstein (sp?) as well
Influence is an excellent book on psychology