Diane Thornbury

Diane Thornbury




Diane was appointed partner in January 2010 after merging her existing practise with BDO Invercargill.  Diane’s retirement as a partner of BDO Invercargill is effective from 31 December 2020 due solely to health reasons.  Diane continues on a limited basis as a consultant. Raised on a typical Southland sheep farm and currently farming deer on a property just north of Invercargill, Diane’s blend of professional skills and practical experience is highly valued by her clients.

Diane provides consulting and accounting services to the Commercial, Farming and Rural services sectors. More specifically, Diane provides clients with Advisory and Taxation Services, preparing cash flows forecasting/budgeting, business plans, new venture start up, business development and growth strategies, monthly management reporting, and accounting software system selection.

Diane is Co-Founder of the Glass Elevator, a professional women’s networking group that encourages women in business to excel and support others towards greater success.

Diane has also been a member of the BDO New Zealand National Management Board since 2014.



Chartered Accountant (Chartered Accountants Australia & New Zealand)

Accreditation in Family Business and Succession


Professional Affiliations

Co-Founder of Glass Elevator Professional Women’s Network 

Member of Chartered Accountants Australia & New Zealand


Bachelor of Commerce 



Treasurer of the Invercargill Gymnastics Club Inc

Trustee of the 1000 Days Trust

Glass Elevator Board Member