First off, I would like to thank Mike and Mark for this great resource. I love the Manager Tools approach - for a young person like me it's like you're handing pure nuggets of gold in each and every podcast.
As someone with much less experience than most of the MT audience, I would like to ask:
If you had to name three people/activities/courses/jobs that you feel had the greatest impact in your professional career, what/who would they be?
What advice did you find to be useful when you were starting up your careers?