Insert grid of images into about page
There are different pieces to this problem.


The grid with images.
You can do that with Views. I'd say create a Views display of type "Block".
E.g. if every member of the company is a node or a user with an image field, then you can use the view to show an image for each of them. There is a display plugin to show items in a grid.
Display this stuff on one page.
One way to do that is with panels.
Another way is to create a node type with a Block reference field in addition to the body text field. You create the about page as a node of that type, and fill in the body text and reference the Views block you just created.
Yet another way is to simply put the block into a theme region, and configure it to only show up on the "about" path.


Another way for all of this is to create a node type with a multiple-value image field. This is if you don't want every single member of the company to be a node or user entity by itself.

Then you can use a custom formatter, or just some CSS, or Display suite hook_ds_field_theme_functions_info(), to display the images in a grid.