Our Team

Our leadership team and senior management

Denise Primrose

General Manager

Denise Primrose was appointed Royston General Manager in August 2009. Denise held Operating Theatre management positions in the public sector prior to joining the Royston theatre team in April 2001.

She was appointed Director of Nursing in 2003, a position she held for 6 years. In her current role as General Manager, Denise is responsible for all clinical and operational aspects of Royston Hospital. She is also the Chairperson of the Royston Clinical Advisory Committee whose function is to maintain Royston’s clinical and medical standards.

Anna Harland

Theatre Services Manager

Anna Harland was appointed the Theatre services manager in March 2022. Anna has a wealth of knowledge and experience within the Operating theatre environment. She has spent the last 25 years in various Clinical Charge nurse and Senior Operational management positions in the public sector, prior to joining Royston. She has a passion for Quality improvement, and has successfully led several award winning improvement projects.

Anna is responsible for all clinical and operational aspects of the Royston Operating theatres, Sterile services, Post anaesthetic care unit and the Patients admissions. She prides herself on establishing and building strong collaborative teams.

Kerri Cooley

Ward Services Manager

Kerri is a Registered General and Obstetric Nurse- who trained and worked many years at MidCentral Health DHB.

Kerri has a wide variety of nursing experience in both clinical and leadership positions with specialty focus in surgical care. Her previous role in HBDHB was as Associate Director of Nursing-Hospital Group and prior to this Nurse Director- Surgical Services for 6 years

Kerri is a strong advocate for nursing and the promotion of excellence in delivery of care to our patients and community. She joined our team in her current role at Royston June 2022

Ann-Louise Geary

Administration and Support Services Manager

Ann-Louise Geary joined Royston Hospital in August 2003 initially as the Administration Team Leader. Her title changed in February 2010 to Support Services Team Leader to better reflect her role which encompasses administration, IT, household and property areas.

Ann-Louise is also the management representative on the Environment and Safety Committee. Prior to Royston Hospital, Ann-Louise was a Team Leader, responsible for administering Superannuation Schemes.


Our Evolution leadership team

Stephen Johnston

Chief Operations Officer

Stephen Johnston has held senior management positions in various Australian Healthcare organisations over the past 20 years. Prior to joining Evolution Healthcare as Chief Operating Officer in September 2019, Stephen was a Director at Sydney Adventist Hospital, this position saw him lead a multidisciplinary team in building and developing the supporting staff and infrastructure of one of Australia’s largest Private Hospitals.

During Stephen’s five years with Evolution Healthcare, Stephen has transitioned from the General Manager/DON of Waratah Private Hospital in NSW. Under his direction he commissioned the Rehabilitation Centre at Waratah Hospital including a modern gym and hydrotherapy pool with growth in both inpatient and day rehabilitation services developing the Hospital into its future as the centre for rehabilitation excellence in South/West Sydney.

Ben Thynne


Over the past fifteen years, Ben Thynne has gained significant experience in acquiring, redeveloping and managing private hospitals with a focus of delivering excellence in healthcare. Prior to founding Evolution in 2011, Ben was the Founder and Managing Director of Healthe Care Australia. Under Ben’s management, Healthe Care became Australia’s largest privately-owned network of private hospitals. For several years Ben was a director of the Australian Private Hospitals Association. Ben’s qualifications include a Bachelor of Law and a Graduate Diploma in Finance and Investment. He has been admitted to the Supreme Court of Queensland.

Richard Grenfell

Medical Director / Director

With over 35 years as a specialist Anaesthetist, Richard Grenfell founded Boulcott Hospital in Wellington, serving as founding Chairman and CEO. He has been intimately involved in the operational management whilst elevating the medical and surgical capability of the hospital since its inception. Richard stepped down from his role as Chairman in 2005 and as Managing Director in June 2015. He was a Director of Wakefield Hospital from 1989 to 1997 and is currently the Medical Director and a Director of Evolution Healthcare.

Matthew Clarke

Chief Financial Officer

Matthew Clarke brings extensive experience providing strategic financial leadership across a portfolio of businesses with over 20 years of experience in finance and commercial management roles across the services and resources sectors. Returning to New Zealand in 2019 after 15 years spent mostly in the UK and Australia, Matthew has previously held senior finance positions with global quality assurance provider Intertek Group, including Group Treasurer in London and most recently Regional CFO based in Sydney.

Alongside our Directors and Senior Management, we have our incredible staff and specialists working with us at Royston Hospital. 

Royston Hospital is part of Evolution Healthcare