The Dilleys are strong supporters of the documentation and communication of local history. Since 2006, Thomas Dilley has authored two books about Grand Rapids and Kent County, Michigan postcards, and another about stereocard views of the same area, using images in these publications from his personal collection, as well as the GRPL Postcard Collection (078) and the GRPL Stereocard Collection (076). The Dilley's images may one day be included in this Dilley Collection where they can be routinely shared with area citizen and other researchers.

In addition to the historical materials which they have begun adding to their archival collection, they actively participate in a number of related local organizations. They are members of the Grand Rapids Historical Society, with Thomas currently on the board. Thomas is active in the West Michigan Postcard Collection. Thomas also serves on the Grand Rapids Public Library Foundation Board. The Dilley's monetary donations to the Foundation have supported acquisitions of additional title for the Furniture Design Book Collection. They have also provided archival supplies, such as plastic sleeves for the ever growing GRPL Postcard Collection. Thomas is a member of the Grand Rapids Historical Commission.