At the age of 16, Emmison joined the
Bedfordshire Record Office in
Bedford under the directorship of Dr
G. H. Fowler, then Chairman of the Bedfordshire Records Committee. He was quick to master the work and earn the respect of the county with many important documents being deposited at the record office during his tenure by local churches in particular. Emmison was County Archivist for
Bedfordshire between 1925 and 1938; and County Archivist at
Essex Record Office in
Chelmsford between 1938 and 1969. His "energetic and imaginative approach impressed many", and Essex was considered to have the leading
record system in the country. In time the Essex Record Office became a publishing house for local history and Emmison became a prolific author. His
Tudor Secretary: Sir William Petre at Court and Home was a "significant contribution to Tudor studies". His Elizabethan Life series "demonstrated the richness of sources for the period and his ability to relate local material to the wider canvas". Emmison was a founder member of the
British Records Association in 1932 and the
Society of Local Archivists in 1947. ==Family==