Health Support Services - Our HSS executive team

Our Executive team play a vital role in shaping our future direction and strengthening our position as a trusted partner to the WA health system. They provide strategic leadership across the organisation, inspiring our people to deliver great services, embrace innovation and focus on outcomes that matter the most.

At HSS, leadership is about more than delivering results. Our leaders are valued for being approachable, supportive and authentic, creating an inclusive culture where people feel respected, empowered and connected to our purpose.

	Giles Nunis \| Chief Executive Giles Nunis has a wealth of experience and a deep understanding of the health and technology sectors, which he demonstrated on the HSS Board. Over his career, Giles has served in various senior leadership roles in across government and industry. Prior to joining HSS, he was Executive General Manager, Digital Transformation at the WA Primary Health Alliance, where he led major initiatives to modernise and streamline healthcare delivery. Known for his strategic vision and commitment to digital transformation, Giles has a proven track record of delivering impactful change across complex systems. “I look forward to helping shape one of the most significant digital health transformation journeys in Western Australia—one that empowers health service professionals and ultimately benefits all Western Australians.”
	Anthony Lenzarini \| Chief Information Officer With more than 30 years’ experience in the digital and ICT sector, Anthony (Tony) Lenzarini has dedicated much of his career to WA public health, leading large multidisciplinary teams across a broad range of ICT functions and strategic digital initiatives. A passionate technology leader, Tony is recognised for his steady solution-focussed approach and a genuine commitment to people. He continues to drive the modernisation of HSS’s digital services, with a strong focus on delivering simpler, faster, and cost-effective outcomes for WA Health. His leadership in cyber security and connected healthcare collaboration is critical to protecting and enabling our services in the future.
	Chad Martino \| Acting Executive Director, Transformation and Strategy Chad has worked in the WA public sector for the past several years, including six years in a senior executive role at the Department of Health. Chad brings a wealth of knowledge and experience across diverse portfolios, in particular Government and stakeholder relations. An experienced health leader, Chad specialises in issues and crisis management, corporate strategy, stakeholder engagement, policy implementation, government relations, change management and strategic leadership. “HSS has an ambitious reform agenda that will make a positive difference across our broad health system. I am looking forward to working with the leadership team to continue to drive improvement and build on our success to date.”
	Sam Matyear \| Acting Director, Office of the Chief Executive Sam is a strategic leader with broad experience in organisational transformation, stakeholder engagement, and complex program delivery across government and industry. As Director of the Office of the Chief Executive, Sam leads HSS’ governance, risk and compliance, integrity, audit, communications, and Board liaison functions, supporting the Chief Executive to deliver on organisational priorities and strengthen accountability across the WA health system. With a background in politics, corporate affairs, and strategic transformation, Sam has deep experience advising senior leaders and aligning diverse stakeholders behind shared goals. He is passionate about building values-driven teams and ensuring their work strengthens not only systems and processes, but also culture, trust, and public value. “I’m passionate about leading with integrity and purpose, helping shape a health system that’s connected, efficient, and responsive to the needs of the community.”
	Amanda Mulcahy \| Acting Executive Director, Workforce and Organisational Development Amanda Mulcahy is a senior health executive with extensive experience spanning workforce strategy, health policy, performance reporting, governance and organisational leadership. She brings a strong focus on system performance and optimising our health workforce. She is passionate about using data and insights to drive actionable health system change. Amanda is committed to ensuring these efforts translate into better outcomes for patients, families and communities.
	Neha Patel \| Executive Director, Human Resource Management Information System Neha Patel is a visionary technology and business leader with over 15 years of experience delivering high impact programs across telecommunications, Cloud and enterprise technology with proven success leading large scale portfolios, including Delivery Performance across Telstra’s $400m+ portfolio. She has held senior leadership roles in the private sector and through those roles has served the public sector, shaping digital, infrastructure and transformational strategies. With a deep understanding of service delivery and the operational realities of large-scale environments, Neha is known for her strategic acumen and dedication to fostering inclusive leadership. She is passionate about working with purpose and driving meaningful community impact and serves on the boards of multiple not-for-profit organisations. Neha is leading the delivery of HRplus, a HR, payroll and rostering solution for the WA health system, with rollout commencing in 2025.
	Emily Pestell \| Executive Director, People, Capability and Culture Emily Pestell has broad business experience in leading governance, strategy and transformation portfolios. Over the past decade, she has worked for the Western Australian State Government, starting at the Department of Finance before joining WA Health in 2014. Emily established the Office of the Chief Executive as a standalone business unit responsible for Governance, Risk, Compliance, Internal Audit, Communications, Ministerial and Parliamentary Liaison. In 2020, she played a key role in HSS' COVID-19 crisis management, while successfully leading the establishment and implementation of the inaugural HSS Board. Throughout her career at HSS, Emily has led transformation projects across governance, customer experience, compliance and people-related functions. Most recently Emily was instrumental in preparing HSS for the adoption of a new HR and rostering solution in 2025.
	Dr Sumit Sinha-Roy \| Executive Director Electronic Medical Records Dr Sumit Sinha-Roy brings extensive experience in digital health, clinical operations, strategy, and leadership. He played a key role in WA Health’s COVID-19 response as Operations Executive Lead and was Medical Advisor for the State Health Operations Centre for two years, where he helped advance the State Health Operation Centre's data initiatives. With a background in acute medicine, Dr Sinha-Roy has been working with the Community Virtual Care team and Home Hospital, located in Royal Perth Hospital, focusing on remote patient monitoring initiatives.
	Mark Thompson \| Chief Procurement Officer Mark Thompson leads the modernisation of procurement and supply services to reduce supply risk, improving service delivery and maximising return on investment across HSS and the WA health system. Mark has more than 20 years’ experience at a senior management level in the health care, utilities and telecommunications industries in the government, private and not-for-profit sectors. He led numerous multi-disciplinary teams covering procurement, contract management, purchasing, supply chain, fleet, sales and bidding. Prior to joining HSS, Mark managed a large procurement, warehousing and logistics function, and led one of WA’s largest and most complex fleets. He implemented a major procurement operating model, which included the development of a long-term sustainable supply chain strategy. “Working together to improve our supply chain will lead to efficiencies and increase the reliability and responsiveness of supply to support the WA health system.”
	Sash Tomson \| Chief Financial Officer Sash Tomson is a management and finance professional with over 20 years’ experience as a senior executive, having held executive finance positions in private and government sectors. Sash has extensive experience in financial management, corporate strategy and policy, evaluating the financial impact of new business initiatives, financial modelling, negotiating and overseeing commercial contracts. As well as health, he has worked in private practice, construction and mining. During his time with WA Health, Sash served as Acting Chief Executive of PathWest and Acting Assistant Director-General at the Department of Health, demonstrating strong leadership across one of the State's most complex health entities.
	Gary Fosberry \| Acting Executive Director, Customer Experience

Last Updated: 06/08/2026

	Giles Nunis \| Chief Executive Giles Nunis has a wealth of experience and a deep understanding of the health and technology sectors, which he demonstrated on the HSS Board. Over his career, Giles has served in various senior leadership roles in across government and industry. Prior to joining HSS, he was Executive General Manager, Digital Transformation at the WA Primary Health Alliance, where he led major initiatives to modernise and streamline healthcare delivery. Known for his strategic vision and commitment to digital transformation, Giles has a proven track record of delivering impactful change across complex systems. “I look forward to helping shape one of the most significant digital health transformation journeys in Western Australia—one that empowers health service professionals and ultimately benefits all Western Australians.”
	Anthony Lenzarini \| Chief Information Officer With more than 30 years’ experience in the digital and ICT sector, Anthony (Tony) Lenzarini has dedicated much of his career to WA public health, leading large multidisciplinary teams across a broad range of ICT functions and strategic digital initiatives. A passionate technology leader, Tony is recognised for his steady solution-focussed approach and a genuine commitment to people. He continues to drive the modernisation of HSS’s digital services, with a strong focus on delivering simpler, faster, and cost-effective outcomes for WA Health. His leadership in cyber security and connected healthcare collaboration is critical to protecting and enabling our services in the future.
	Chad Martino \| Acting Executive Director, Transformation and Strategy Chad has worked in the WA public sector for the past several years, including six years in a senior executive role at the Department of Health. Chad brings a wealth of knowledge and experience across diverse portfolios, in particular Government and stakeholder relations. An experienced health leader, Chad specialises in issues and crisis management, corporate strategy, stakeholder engagement, policy implementation, government relations, change management and strategic leadership. “HSS has an ambitious reform agenda that will make a positive difference across our broad health system. I am looking forward to working with the leadership team to continue to drive improvement and build on our success to date.”
	Sam Matyear \| Acting Director, Office of the Chief Executive Sam is a strategic leader with broad experience in organisational transformation, stakeholder engagement, and complex program delivery across government and industry. As Director of the Office of the Chief Executive, Sam leads HSS’ governance, risk and compliance, integrity, audit, communications, and Board liaison functions, supporting the Chief Executive to deliver on organisational priorities and strengthen accountability across the WA health system. With a background in politics, corporate affairs, and strategic transformation, Sam has deep experience advising senior leaders and aligning diverse stakeholders behind shared goals. He is passionate about building values-driven teams and ensuring their work strengthens not only systems and processes, but also culture, trust, and public value. “I’m passionate about leading with integrity and purpose, helping shape a health system that’s connected, efficient, and responsive to the needs of the community.”
	Amanda Mulcahy \| Acting Executive Director, Workforce and Organisational Development Amanda Mulcahy is a senior health executive with extensive experience spanning workforce strategy, health policy, performance reporting, governance and organisational leadership. She brings a strong focus on system performance and optimising our health workforce. She is passionate about using data and insights to drive actionable health system change. Amanda is committed to ensuring these efforts translate into better outcomes for patients, families and communities.
	Neha Patel \| Executive Director, Human Resource Management Information System Neha Patel is a visionary technology and business leader with over 15 years of experience delivering high impact programs across telecommunications, Cloud and enterprise technology with proven success leading large scale portfolios, including Delivery Performance across Telstra’s $400m+ portfolio. She has held senior leadership roles in the private sector and through those roles has served the public sector, shaping digital, infrastructure and transformational strategies. With a deep understanding of service delivery and the operational realities of large-scale environments, Neha is known for her strategic acumen and dedication to fostering inclusive leadership. She is passionate about working with purpose and driving meaningful community impact and serves on the boards of multiple not-for-profit organisations. Neha is leading the delivery of HRplus, a HR, payroll and rostering solution for the WA health system, with rollout commencing in 2025.
	Emily Pestell \| Executive Director, People, Capability and Culture Emily Pestell has broad business experience in leading governance, strategy and transformation portfolios. Over the past decade, she has worked for the Western Australian State Government, starting at the Department of Finance before joining WA Health in 2014. Emily established the Office of the Chief Executive as a standalone business unit responsible for Governance, Risk, Compliance, Internal Audit, Communications, Ministerial and Parliamentary Liaison. In 2020, she played a key role in HSS' COVID-19 crisis management, while successfully leading the establishment and implementation of the inaugural HSS Board. Throughout her career at HSS, Emily has led transformation projects across governance, customer experience, compliance and people-related functions. Most recently Emily was instrumental in preparing HSS for the adoption of a new HR and rostering solution in 2025.
	Dr Sumit Sinha-Roy \| Executive Director Electronic Medical Records Dr Sumit Sinha-Roy brings extensive experience in digital health, clinical operations, strategy, and leadership. He played a key role in WA Health’s COVID-19 response as Operations Executive Lead and was Medical Advisor for the State Health Operations Centre for two years, where he helped advance the State Health Operation Centre's data initiatives. With a background in acute medicine, Dr Sinha-Roy has been working with the Community Virtual Care team and Home Hospital, located in Royal Perth Hospital, focusing on remote patient monitoring initiatives.
	Mark Thompson \| Chief Procurement Officer Mark Thompson leads the modernisation of procurement and supply services to reduce supply risk, improving service delivery and maximising return on investment across HSS and the WA health system. Mark has more than 20 years’ experience at a senior management level in the health care, utilities and telecommunications industries in the government, private and not-for-profit sectors. He led numerous multi-disciplinary teams covering procurement, contract management, purchasing, supply chain, fleet, sales and bidding. Prior to joining HSS, Mark managed a large procurement, warehousing and logistics function, and led one of WA’s largest and most complex fleets. He implemented a major procurement operating model, which included the development of a long-term sustainable supply chain strategy. “Working together to improve our supply chain will lead to efficiencies and increase the reliability and responsiveness of supply to support the WA health system.”
	Sash Tomson \| Chief Financial Officer Sash Tomson is a management and finance professional with over 20 years’ experience as a senior executive, having held executive finance positions in private and government sectors. Sash has extensive experience in financial management, corporate strategy and policy, evaluating the financial impact of new business initiatives, financial modelling, negotiating and overseeing commercial contracts. As well as health, he has worked in private practice, construction and mining. During his time with WA Health, Sash served as Acting Chief Executive of PathWest and Acting Assistant Director-General at the Department of Health, demonstrating strong leadership across one of the State's most complex health entities.
	Gary Fosberry \| Acting Executive Director, Customer Experience

Our Executive team

Giles Nunis | Chief Executive

Anthony Lenzarini | Chief Information Officer

Chad Martino | Acting Executive Director, Transformation and Strategy

Sam Matyear | Acting Director, Office of the Chief Executive

Amanda Mulcahy | Acting Executive Director, Workforce and Organisational Development

Neha Patel | Executive Director, Human Resource Management Information System

Emily Pestell | Executive Director, People, Capability and Culture

Dr Sumit Sinha-Roy | Executive Director Electronic Medical Records

Mark Thompson | Chief Procurement Officer

Sash Tomson | Chief Financial Officer

Gary Fosberry | Acting Executive Director, Customer Experience