This diagram illustrates the career path of the American President – the branches represent his education and the work experience. I think the size of the circles represent the relative time spent in a particular role.
If you would like to have something similar for your own career, simple head over to Newsweek.com and import your LinkedIn profile.
The more details you have in your LinkedIn profile, the ‘fuller’ your tree will be. You may also add details of your career to the tree manually using the “career tree form” available on the same page without changing your main LinkedIn profile.