Our world now revolves around Google and the internet. We all search for information all the time. So make sure you know what's out there about you. Do your online ego search and make sure you do it on various ways your name would look - full text, last name and first initial, etc. Remember that much information is cached and someone might be able to find a posting from your younger days. Make sure you know what's out there that may be seen in a negative light before you learn about it from someone interviewing you (if you even get that far!).
Taking control of YOU means ensuring that you have the widest electronic presence possible. If you aren't already doing all these things, you need to.
Join your professional organizations. For public health careers, join APHA and add GHC (Global Health Council) if you're interested in working in international development. Don’t forget about special-interest groups in organizations as well.
Make sure you've joined professional networking sites. Take the time to fill in your profile on LinkedIn - and don't be afraid to post your photo. Join DevEx if you are interested in international work.
Sign up for a variety of professional listserves - and take the time to read the e-newsletters. You will find listserves in your professional area of interest - and you should expand this to include job e-letters as well. Even if you have a job, job postings are a good way for you to quickly learn what your colleagues (and competitors) are doing.
Use other electronic sources for potential employers and colleagues to learn about you. These include sites such as Visual CV (where your CV can always be kept up to date!) and Google profile.
Check and verify citations. If you've written any reports or monographs - even if they aren't peer-reviewed publications, search and see if these are posted or referenced at all. If so, they will show up on a search that a potential employer may do - and it will reinforce the value of the work you've done. And don't forget to check that these gray-literature citations match the cite you have shown in your CV.
Take responsibility for your own professional development and your own persona - and job and career will follow.