Contact us on 07 348 3599 or by email

Our Team


Glenn Hawkins

BMS(Hons) MMS CA | Ngāti Whakaue, Ngāti Maniapoto

Before establishing this accounting and consulting practice in 2005, Glenn was Finance Manager, then General Manager, of the New Zealand Māori Arts & Crafts Institute (Te Puia). As a Chartered Accountant, he has a varied background that includes roles as management consultant with Ernst & Young and management accountant for a manufacturer and exporter. Glenn has extensive experience with Māori post-settlement governance entities (PSGEs), Māori incorporations, Māori land trusts, service providers, marae and non-profit organisations. Glenn is passionate about Māori business development and has helped numerous Māori commercial organisations in industries as diverse as tourism, agribusiness, fisheries, property, geothermal, forestry, education, health and aquaculture. He is also the Te Puni Kōkiri accredited business mentor for the Rotorua region. Glenn has governance roles with a range of client companies and Trusts and has been a fully qualified Chartered Accountant for 16 years.


Mere George

BMS CA | Ngāti Whare, Ngāti Manawa, Tūwharetoa, Ngāti Porou

Mere became a qualified Chartered Accountant in 2005, while working at Deloitte as an auditor in Risk and Assurance from graduation until early 2009.  Mere has worked with commercial entities across a broad range of industries, including Māori businesses, public sector entities, telecommunications and insurance. In 2009, Mere returned home to Rotorua working with Hulton Patchell Ltd, before joining GHA in June 2012. Mere enjoys working closely with iwi groups, Māori trusts, marae and incorporations. Mere is a conscientious and honest professional committed and passionate about Māori business and Māori economic development.

Glenn Cash
General Manager

DipLaw | Te Whakatōhea, Ngāti Porou, Ngāi Tuhoe

Glenn has experience working in small, medium and large businesses including 11 years with Telecom NZ as account manager to some of NZ’s largest companies and holding senior management roles in marketing.  She has worked as a Partnerships Ranger with the Department of Conservation and was GM of a specialist consultancy firm and PTE working in the fields of resource management, environmental protection, health and safety at work and hazardous substances.  From 2009 to 2014 she was General Manager of CNI Iwi Holdings Ltd, working closely with the 8 central north island Iwi. Glenn brings a depth of knowledge and skill from a successful corporate career and her unique experience supporting post-settlement Iwi governance, particularly in regards to Trust law and collaborative investments.  She is passionate about water and land conservation and engaging rangatahi to build a prosperous future.

Oksana Kahlenberg
Accounting Manager


Oksana was born and raised in Riga, Latvia, where she completed her degree and worked as an accountant for various commercial entities.   She moved to New Zealand in 2008, and has since settled in Rotorua. Before joining the GHA team in August 2013, Oksana worked for a Chartered Accounting firm in Rotorua and Whakatane. She has several years of experience working with a variety of clients across different industries, with particular interest in education sector, including early childhood education.

Donelle Leef

Donelle Leef
Accounting Assistant Manager

NZDipBus | Rongomaiwahine

Born and raised in Rotorua, Donelle worked within the audit division of a local accounting firm for four years before leaving for Sydney in 2012.  After realising her heart was in Rotorua, she returned home at the end of 2013 and joined the GHA team as an Accountant in May 2014.  Donelle has completed all academic and practical requirements for full membership of the New Zealand Institute of Chartered Accountants as an Accounting Technician, and intends to continue studying towards becoming a Chartered Accountant. She is keen to build positive working relationships and to contribute to the future success of GHA clients.

Isabelle Yee
Accounting Assistant Manager


Isabelle joined the GHA team as an accountant in May 2017.  Isabelle is originally from China and moved to New Zealand in 2003.  She completed her Bachelor of Commerce and Administration in 2006 at Victoria University majoring in accounting. Before joining the GHA team, she worked as a tax accountant at several Chartered Accountant firms in Tauranga and Rotorua. Isabelle has worked with clients in various industries, ranging from small businesses to large farms. Isabelle understands the importance of maintaining a positive client relationship and is committed with helping GHA clients to succeed.

Te Hau Tutua

Te Hau Tutua

BMS  | Ngāti Awa, Whakatōhea, Tūhoe

In 2004 Te Hau completed a BMS degree in Finance and Accounting and returned home to the Eastern Bay of Plenty to work. He has had a variety of roles having held positions across the energy, forestry and Māori business sectors. With a passion for kaupapa Māori, he has worked for PTEs, Hauora, Land Trusts and Iwi PSGEs delivering financial management and accounting expertise. Prior to starting with GHA, Te Hau worked as Group Manager for the Tūhoe PSGE -Tūhoe Te Uru Taumatua – working to establish the foundational infrastructure to grow Ngāi Tūhoe assets and permanency. He holds several governance positions on a number of local Māori land trusts, CNI Iwi Holdings Ltd, and the Dream Chaser Cancer Charity.

Stacey Winiata

Stacey Winiata

BBA | Ngāti Awa, Ngāti Patumoana, Whakatōhea

Stacey joined GHA in August 2015 after graduating from the University of Waikato in 2014 with a Bachelor in Business Analysis, majoring in Accounting.  Stacey is passionate about accounting and helping clients to reach their objectives.  Her quietly conscientious and hard-working nature is attested to by her supportive whānau and already evident in her work at GHA.  GHA are pleased to be supporting Stacey on her pathway to becoming a Chartered Accountant.

Matiria Temara

Matiria Temara

NZDipBus BBA | Tūhoe, Ngā Puhi

Matiria is of Tuhoe and Ngāpuhi decent and a graduate of kōhanga reo and kura kaupapa Māori. In 2013, she graduated from the University of Waikato where she completed a Bachelor of Business Analysis majoring in Accounting.  Matiria sees her role at GHA as an opportunity to develop her skills and experience further in a professional Māori environment. GHA are pleased to be supporting Matiria on her pathway to becoming a Chartered Accountant.


Zara Morrison

BCA/BSC CA | Te Arawa, Ngāti Whakaue, Ngāti Tūwharetoa, Ngāti Turumakina

Zara grew up in Rotorua and became a qualified Chartered Accountant in 2011, while working as a tax consultant at Ernst & Young Wellington.  She then spent almost 5 years living in Germany and recently returned home with her family to join GHA in September 2016.  Zara has previous experience in tax structuring advice for Iwi PSGE’s and has a passion for helping Maori businesses succeed.  Zara is dedicated to giving back to her iwi and developing positive relationships with GHA’s clients.

Jessica Kemp

NZDipBus | Te Whakatōhea

Originally from Opotiki and raised in Rotorua. Jessica has worked in tourism for the past two years whilst studying towards a Bachelor of Management majoring in Accounting and hopes one day of becoming a Chartered Accountant.


Miriama Raharuhi

BBA | Te Whakatōhea, Ngāti Pikiao

Born and raised in Rotorua, Miriama is of Te Arawa (Ngati Pikiao) and Mataatua (Whakatohea) descent. She graduated from the University of Waikato with a Bachelor of Analysis degree majoring in Accounting and Finance. Prior to joining GHA Miriama worked for local accounting firms in Rotorua including Deloitte as an intermediate consultant. She is determined to complete her Chartered Accountancy in the near future with the support of GHA and is very passionate about Te Reo Māori initiatives and kapa haka.

Sheryl Dudson

Sheryl Dudson

Sheryl was born and raised on a Rotorua dairy farm. When she finished school she worked for a Chartered Accountant in Tauranga before heading back to Rotorua. After working for a well-known local firm since 2005 as their Administration Manager, Sheryl committed to furthering her career in Accounting and joined GHA in 2014. Sheryl thrives on building positive working relationships and is passionate about contributing to the future success of GHA clients.

Keri Te Tamaki

Keri Te Tamaki

Ngāti Tura, Ngāti Te Ngakau

Originally on reception, Keri has re-joined the accounting team after spending two years abroad. Keri was born and raised in Rotorua. She previously spent six years in Hamilton working in both the motor industry and the training of horses in dressage but has decided to return home to pursue a career in Accounting. Keri studied Mathematics at the University of Waikato and is currently studying towards her Diploma in Accounting. Keri is excited to be home in Rotorua and building strong relationships within the team and client base.

Ranui Maxwell
Board Secretary

Ngāti Rangiwewehi, Ngāti Whakaue, Ngāti Awa, Te Whānau-a-Apanui

Born and raised in Dunedin, Ranui moved to Rotorua with her two young sons Ariariterangi and Aniwa last year.
Ranui has at least 12 years general administration experience across public and private sectors. She is currently studying towards a communication diploma completing her BA and looks forward to contributing to Maori success.

Kateriina Selwyn
Management Consultant and Maori Sector Manager for CA ANZ

BMS | Te Arawa, Ngā Puhi, Tūhoe

Kateriina has recently completed her Bachelor of Management Studies (BMS) degree, majoring in Marketing at the University of Waikato.  In her final year at Waikato, Kateriina worked as a Marketing Intern at Ebbett Volkswagen Hamilton and was also selected as one of the recipients of the Tāwera Scholarship.  Kateriina is pleased that securing mahi in Rotorua has allowed her to move back to her home in Rotoiti. Kateriina is committed to Māori business and economic development.


Matiu Taurau
Consulting Manager

BCom CA | Rangitāne, Ngā Puhi, Ngāi Tahu, Ngāti Kahungunu

Matiu joined the GHA team in November 2015 as a management consultant bringing with him a wealth of international and local experience in business. Matiu has been a Chartered Accountant since 2008, and most recently worked for listed company Comvita as their accountant. Previously, Matiu worked as an auditor with Audit New Zealand before heading to the UK where he worked with Fortune 500 company General Electric. Matiu’s knowledge and experience spans a number of industries and sectors including agriculture, manufacturing, healthcare, retail and Māori authorities. Matiu is pleased to be lending his considerable talent, skills and energy to helping our clients succeed.

Brook Grant
Management Consultant

BSc (Chemistry), PGDipGrad (Finance) | Ngāti Whakaue, Te Arawa

Brook joined the GHA team in April 2017, bringing over 10 years’ experience in banking and financial advisory services, having worked in London, Dublin and here in New Zealand. Brook has held senior roles in Bancorp Treasury Ltd and BNZ and has professional experience in SIPO development, fixed income investment, treasury risk management strategies, financial markets trading, and financial and econometric modelling. Brook is passionate about elevating the use of te reo Māori in the commercial world, and has become the first te reo Māori financial commentator on television, delivering a fortnightly wrap of topical financial issues entirely in te reo Māori, on Te Karere. Brook is a Trustee of Tuia Charitable Trust, which is focussed on empowering Māori rangatahi.

Rachel Hoffman
Personal Assistant

Ngāti Pikiao

Rachel joined the GHA team in September 2017 as personal assistant to Glenn and Mere. Born and raised in Rotorua, Rachel brings a range of skills and experience to the position. Prior to working at GHA, Rachel was the receptionist and administrator at Iles Casey Chartered Accountants and before that worked as a personal assistant for a local real estate agent. With a natural affinity for people and management coupled with an eye for detail and efficiency, Rachel will enjoy the challenges that a multifaceted role brings. Rachel looks forward to growing her Te Reo Māori and enhancing her knowledge of kaupapa Māori.

Melissa Katting
Personal Assistant

Te Arawa – Ngāti Mākino, Ngāti Whakaue, Tūhourangi – Ngāti Wāhiao

Melissa has been an integral part of the GHA team since joining in 2014. After an exciting start in Real Estate, she decided to take her career in a new direction and enter into the Māori business sector. Melissa has a passion for helping people and utilises her extensive organisational skills to support the partners of the firm. She is an innovative problem solver with strong interpersonal skills. Outside of work she is a dedicated mother and student. Melissa is excited for the future and hopes to continue to contribute to Māori and the Māori business sector. 

Kere Mitai
Senior Administrator

NZDipBus | Te Whakatōhea, Ngāti Pikiao, Tūhourangi – Ngāti Wāhiao

Born and raised in Rotorua, Kere’s family ties stretch far and wide around the city. Kere attended both Kohanga Reo and Kura Kaupapa Māori her entire schooling years making her fluent in Te Reo Māori. She then went to study and gained her NZ Diploma in Business in 2012. Since studying, Kere has travelled the world, gaining different experiences whilst working in a number of various roles. Joining GHA in July 2017, Kere’s previous experience in management, accounting and administration is a great pillar to guide her in her new role as the Senior Administrator.


Jason Mika

Dr Jason Mika

BMS(Hons) MPP PhD | Tūhoe, Ngāti Awa, Whakatōhea, Ngāti Kahungunu

Jason has been a consultant for GHA since the company was formed. Jason specialises in Māori enterprise development and Māori organisational development. Jason’s strengths are in developing strategies, plans and policies to help Māori enterprises and Māori organisations succeed. He was raised in Rotorua and has completed consultancy assignments for Māori organisations locally and across the motu. Jason is a senior lecturer in the School of Management, Massey University in Palmerston North and co-director of Te Au Rangahau, Māori Business & Leadership Research Centre. Jason provides consulting services as an independent management and associate of GHA.

Arapeta Tahana

NZDipBus | Ngāti Pikiao, Ngāti Mākino, Tapuika

Arapeta joined GHA as consultant in June 2014, following a role as a Portfolio Manager with Te Tumu Paeroa (the Māori Trustee) and previous roles in Wellington.  Arapeta has a depth of practical experience as a business owner, consultant and trustee across a range of sectors. He has worked with Māori land trusts, PSGEs, Māori service providers, small Business and Local Government as a consultant on strategic projects.  He has extensive experience engaging communities, iwi and Māori organisations to establish aspirations and priorities for their future development. His skills in these areas include facilitation, engagement methodology, thematic analysis and communicating in Te Reo and English. He currently holds several governance roles as a Councillor of the Bay of Plenty Regional Council, Trustee of Rotoiti 15 Ahu Whenua Trust and Iwi Elected member of the Te Arawa Standing Committee. Arapeta enjoys assisting Māori to develop and execute strategies that realise their aspirations. He is passionate about Māori development with a focus on futures planning, economic development and leadership.