The career advice from Sir Michael Atiyah, Béla Bollobás, Alain Connes, Dusa McDuff, and Peter Sarnak is here:
Advice to a Young Mathematician
This is an excerpt from The Princeton Companion to Mathematics. By the way, the most recent errata for PCM are here.
See also excellent career advice and writing tips from the blog of Terence Tao and Six Rules for Rewriting at the Michael Nielsen’s blog.
Update: there is a also a large interview (available at several places on the web) with Alain Connes where he inter alia provides some career advice.
Update 2: interviews with Maxim Kontsevich and Sergey Novikov containing some nice bits of career advice are available here and here
Update 3: a recent interview with Terence Tao
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