Stephen - Thanks for the input!
Dan,
There are few ways you can do this. Stephen's suggestion can be done. Another way would be to create two sections, each with a grid. One grid would be your editable grid with the fields you only want your one person to see. The other section would have a grid the rest would see (without the editable fields). You can then create an "OnScreenLoad" action to hide/show the section according to the user.
Therefore, when the screen loads and its the admin, you can hide the section with the limited grid and show the editable grid. If its any of the other users, the default would be to show the grid with limited fields. To do this, you'd have to use the Show/Hide Section action.
Hope this helps,
- Adam