Team

Director - Finance and Administration

Kieran O'Hagan

Kieran is a seasoned entrepreneur and strategic advisor with extensive experience guiding boards and senior leadership teams across New Zealand. His diverse governance portfolio spans a range of industries, including horticulture, agri-tech, enterprise software, property development, investment management, and education. He holds a diploma in business from Massey University, is a former Associate Member of the New Zealand Stock Exchange, a Certified Securities Analyst, and an Authorised Financial Adviser.

General Manager - Operation and Sustainability

Xan Harding

Xan Harding leads Greencollar’s operations and sustainability efforts in Hawke’s Bay. With extensive experience in viticulture, environmental management and local government, Xan is dedicated to supporting the team to produce premium-quality grapes while minimising environmental impact, optimizing efficiency, and ensuring safety at every step. His commitment to sustainability helps drive our continuous improvement in responsible farming practices and innovation.

Vineyard Manager

Takayuki Kagayama

Information & communication technology

Nozomu Takahashi

Sales and Administration

Kumiko Koizumi

Managing Director

Shin Koizumi

Ambassador

Sir John Kirwan

Sir John is legendary, not only for his role as a member of the All Blacks (New Zealand's national rugby team) but, post-rugby career, as a globally recognised mental health advocate. His mission to help people improve their mental health aligns closely with our commitment to help our team members be the best they can be – looking after themselves at work and at home. We are very proud to have Sir John agree to be Greencollar New Zealand’s ambassador, and strive every day to live up to the standards he epitomises. We encourage our team members to ensure they do something every day that supports their mental health, whether that be reading, sports, playing, crafts . . . adding things to our lives that help us feel and function well.

Chief Technical Officer

Tetsuya Higuchi

With nearly 30 years of expertise in growing premium table grapes, Tetsuya Higuchi is a master of his craft, renowned for his work in both Japan and New Zealand. Originally from Japan's Yamanashi Prefecture — an area famed for its advanced grape-growing techniques — Tetsuya brings unparalleled knowledge and innovation to Greencollar New Zealand. His deep-rooted experience allows him to contribute to the continued growth and development of our Hawke’s Bay vineyard, specialising in cultivar selection and supporting us to pioneer sustainable growing techniques.