Jack Crenor is a native of Clonsilla, who went to school in Porterstown. He worked with the Ordnance Survey in Phoenix Park from 1942 as a surveyor and draughtsman. He described in great detail his time with the Land Commission from 1949 and included his memories of the farmers from the western seaboard who migrated to the better land in the Midlands. He also provides a clear description of the takeover and subdivision of many large estates. While examining an 1836 map of the North Co Dublin he discusses the major changes which have occurred over the years.