Far too many self-help books are written by people who probably could use some help themselves. This seems to be true for this author, who is at the time of this writing is accused of murdering his wife (he posted a confession and photos of the crime scene on Facebook...so he's not only a lousy self-help author, he's a really bad murderer too).
Richard Bolles' "What Color is Your Parachute" is still the gold standard for career management. It's the first place anyone should begin who is interested in managing their career or finding a job. What I find truly remarkable is how Bolles has managed to keep the book updated, fresh and relevant over so many years...at least two decades. I've encountered several people who have said this book changed their life. You can't get a much better recommendation than that.