The better way to do this would be to add the photo of each trustee as a related image to their biography page, then use a Filtered Item List to create the grid of links/images that link to these pages.
The Filtered Item List can be configured to show items in a grid, and each item to show the related image, the teaser, and title of each page that it links to.
This is how the grid is set up on the Features page of the Demo Site.
Hope that helps!
Joe