After gaining a Bachelor of Science degree, Ms Marshall completed a teaching course in Christchurch and took up her first job teaching science at Mt Maunganui College.
Languages teacher Terry Marshall subsequently joined the school's staff and he and Diane started seeing a lot of one another. It was as a couple that they travelled overseas, and during their time away she temped in an accounts department in London.
Returning to New Zealand, they both secured positions at Taradale High School where Ms Marshall taught for 19 years. The school's assistant principal for eight years, she felt ready for a change when she enrolled in EIT's Bachelor of Wine Science programme.
When the head of school position came up, several lecturers encouraged her to apply.
"They persisted and I'm glad they did," she says. "I loved the job and it kept me in contact with the wine industry and on the fringe of people doing research."
Other EIT highlights included staging three wine business symposiums that were well-supported by the industry and developing industry contacts with people such as Kevyn Moore, who initiated the Bragato exchange scholarship for students at EIT and a viticultural school in northern Italy.
"Perhaps you could say I am an education junkie," says Ms Marshall. "Retiring is my leaving school really."
She retired a week after Terry, who taught at Sacred Heart College in Napier. The couple plan to travel, and their first retirement trip will be an exploration of the wine regions of France.