Oonagh is the specialist in charge of the Militaria and Ethnographica Departments, as well as working as part of the general valuations team in the Leyburn salerooms.

Oonagh joined Tennants in 1999 as a general valuer and has since established the Militaria and Ethnographica Departments. These specialist sales have since thrived, attracting dedicated collectors from around the world. Oonagh has a particular interest in researching the history and personal stories behind the items that she sells

Prior to joining Tennants, Oonagh worked for Henry Spencer and Sons Fine Art Auctioneers in Retford for 23 years, where she gained her varied and extensive knowledge of antiques and collectables.