Don't bury the lead. One woman I worked with, who had substantial experience as a CEO, didn't mention this critical fact until three paragraphs into her bio. Spencer Stuart's 2014 Board Index notes 40 percent of director-recruitment briefs seek a sitting or former CEO – so make it easy to find by including this information in paragraph one.
Show your breadth. You are proud of your experience in a functional area, such as HR, so you focus your case for being on the board on the value of your compensation expertise. But when seeking a board role, it's better to show how your management experience will provide benefit across the board (no pun intended) on all or most agenda items while adding real depth in one or two areas. This applies equally to experts in technology, operations, legal, marketing, etc. who are seeking board roles.
Be mindful of overstuffing your resume. Are you one of those leaders who is in a career transition and feeling lost without your title? Have you filled the first page of your resume with grand titles for the LLC that you set up, elaborately describing consulting gigs and making a big showcase of the not-for-profit leadership roles you hold? Headhunters and nominating committees will likely stop reading before they get to the experience that really makes you a good board match. Plus, they sometimes think all that activity makes you too busy to take on board work.