While staff were preparing the exhibition, they came across a collection of wartime photos, including the picture shown here of an unnamed World War I Medical Corps soldier.
There was no information accompanying the photo or others in the Kemp House collection.
"We'd love to hear from anybody who might be able to identify this particular soldier or any of his mates, and who might even be able to provide information about them and their possible connection to Kemp House," Ms Matete said.
Mr Kemp joined up on January 3, 1917, heading to Egypt on the SS Tofua in November that year. He fought the Turks at a crossing on the River Jordan and helped capture Es Salt, Suweilch and Amman.
He was affected by the heat and unsanitary conditions and, after contracting malaria, was invalided back to New Zealand in December 1918.
He returned to sheep farming at Cape Runaway and eventually retired to the family home in Kerikeri, the country's oldest building. He gave Kemp House to the trust in 1974.
*The exhibition runs from April 24-May 12. Admission is $5 or $10 with a guided tour of Kemp House. Anyone with information on the soldier in the photo can email Ms Matete at kkmision@historic.org.nz.