Our Executive Team
Experienced, approachable leaders support us to deliver on our purpose
Our Executive team provides leadership and direction across all areas of HSS, guiding and motivating our teams to add genuine value for our customers. The expertise of our leadership team ensures we’re delivering on our purpose and strategy while always remaining true to the HSS values.Our people value the leaders and managers in our organisation. They are seen as supportive, approachable, caring and understanding. To be successful at HSS, our leaders bring positivity, innovative thinking, empathy, openness, and importantly a confidence to be their authentic selves.
Robert Toms | Chief Executive
Robert has been the Chief Executive of HSS for the past five years. He is focused on ensuring the organisation performs with excellence in responding to the needs of our customers.
Under Robert’s leadership, HSS has transformed its core business operating model to align with the requirements of our customers, resulting in better outcomes for the WA health system and the people who work within it.
Throughout his career, Robert has successfully developed and led the implementation of corporate strategy and business transformation in various organisations to improve efficiency, customer outcomes, organisational performance and employee engagement. Prior to joining HSS, Robert held several senior executive roles in the utilities, retail, mining and management consulting industries and has significant experience with ICT program delivery, procurement and supply chain optimisation.
“By staying true to our purpose and values, I believe HSS is on the right track to becoming the modern and contemporary shared services provider that the WA health system needs now and into the future.”
Jonathan Smith | Chief Information Officer
Jonathan has held three executive management roles since joining HSS in November 2017 and is now leading the HSS ICT business unit to deliver a number of significant ICT initiatives across the WA health system.
Jonathan has a proven track record in developing and delivering successful customer centric technology strategies, business operations and transformational change across a broad spectrum of sectors and business models.
He has previously led organisational and technology transformation in the banking, agriculture and energy industries which resulted in improved business performance and customer-focussed operating models.
“There is a significant amount of change happening in digital health right now and our priority is to support the WA Health system by delivering innovative and secure ICT services that respond effectively and efficiently to the evolving needs of our customers and the wider community.”
Siobhán Mulvey | Executive Director, Workforce and Organisational Development
Siobhán joined HSS in May 2018 with a strong commitment to the development of an organisational culture that supports, encourages and rewards the achievement of business outcomes.
With more than 25 years’ experience as a senior executive in both the private and public sectors, Siobhán has successfully led the implementation of people strategies to improve culture and engagement.
Before joining HSS, Siobhán held senior management positions in the education, training and mining industries, and provided consultancy services to a number of sporting organisations.
“Continuing our journey to align our culture with our operations will enable us to become a high-performing organisation, focussed on supporting our customers to provide excellent health care."
Sash Tomson | Chief Financial Officer
Sash is a management and finance professional with over 20 years’ experience as a senior executive, having held executive finance positions in the 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. Sash commenced as CFO of HSS during 2018, and during his time with WA Health he was Acting Chief Executive for PathWest during 2022-23 and Acting Assistant Director-General for the Department of Health up to October 2024.
Mark Thompson | Chief Procurement Officer
Mark joined HSS in June 2018 and has been leading the modernisation and transformation of procurement and supply services to reduce supply risk while achieving significant return on investment and cost savings 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 Western Australia’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.”
Judith Stewart | Executive Director, HRMIS and EMR
Judith joined HSS in 2022 to lead the Program Delivery Business Unit which is responsible for delivering all major ICT programs and project delivery services across a portfolio driven by business needs. This portfolio, valued at nearly $400M, is driving digital innovation and transformation across the WA health system.
Judith was the Executive Director, Strategy, Policy and Planning at the Department of Health and comes to HSS as a huge asset with 18 years of experience within public and private sector healthcare roles in the UK and Australia.
She was instrumental in the development of the recent Electronic Medical Record (EMR) business case and the mobilisation of the WA health system Digital Strategy.
Judith has led large technology projects in the UK, including EMR implementation with the NHS. In addition, she led the Perth Children’s Hospital Integrated Program Management Office through the construction and commissioning phases of the project during her time with PwC, and managed the Planning Cell in the State Health Incident Coordination Centre in the early phases of the COVID-19 pandemic in WA.
"I firmly believe the HSS value of ‘we make a difference together’ sits at the heart of the Program Delivery portfolio and our culture. I am inspired and excited by the range of Programs and Projects being led and supported at HSS and the range of outcomes and benefits they will provide to WA Health."
Ralph Bates | Executive Director, HRMIS
Ralph joined HSS in 2018 as Executive Director, Customer Experience and through his extensive executive career has ensured the customer is put at the heart of the organisation’s purpose. His experience has led him to successfully develop and execute a number of enterprise customer strategies and lead customer-focused transformation.
In 2018, Ralph was focused on establishing the new Customer Experience business unit, developing customer-focused service level agreements (SLAs) and key performance indicators (KPIs). At the same time, he established a more formal mechanism for HSS to manage performance and simplified how customers contact HSS by implementing an enterprise contact centre.
Since 2020, Ralph has held this key leadership role in our State’s response to COVID-19. He's led the development and delivery of several key COVID-19 digital applications, including SafeWA, VaccinateWA and the WA Health contact tracing systems. He’s also been responsible for HSS' Business Continuity response during the pandemic – ensuring our organisation could continue to support our customers to provide excellent health care to the WA community.
Ralph previously held senior positions in utilities and banking as well as consultancy services.
“Our customers will always be at the centre of everything we do, and we are committed to exceeding their expectations and ensuring their experience with HSS is simple, reliable and responsive."
Emily Pestell | Executive Director, HRMIS HSS Readiness
Emily has been part of HSS since 2016 and has established the Office of the Chief Executive (OCE) as a standalone business unit responsible for Governance, Risk, Compliance, Internal Audit, Communications, Ministerial and Parliamentary Liaison and Board Liaison.
Emily has broad business experience with oversight of strategic management issues, risk and governance. She has worked for the Western Australian State Government for the past 10 years; initially at the Department of Finance before joining the WA health system in 2014.
Emily led the establishment and effective implementation of the inaugural HSS Board in July 2020, played a key role in COVID-19 Crisis Management for HSS and has overseen transformation projects in Governance, Information Management and Employer Value Proposition for HSS.
“Our core values help us to work towards elevating our organisation to operate at a higher standard, enabling us to better support our customers to deliver excellent health care.”
Alison Mann | Director, Office of the Chief Executive
Alison has worked in the WA Health system for almost a decade in senior leadership roles, specialising in the areas of governance, strategic planning, operational, change management, program delivery and corporate and risk management at the Department of Health, North Metropolitan Health Service and most recently HSS.
Since joining HSS in 2020, Alison has worked in several Director level roles across different business units including A/Director Office of the Chief Executive, Program Manager COVID-19 Planning and Director Corporate Development, Customer Experience.
Alison played a key role in COVID-19 Crisis Management and response for HSS, delivering a framework that provides oversight and executive visibility of major COVID-19 response projects and programs across all business units, aligning with HSS’ strategic objectives. She is an experienced leader with a strong focus on people, teamwork and building a strong organisational culture.
Prior to her time in WA Health, Alison has 20 years’ management experience, both internationally and within Australia, in corporate retail and national postal services and was a Sergeant in HM Forces (Royal Military Police) in the UK.
“I believe effective governance is the bedrock of organisational success, and authenticity serves as the compass guiding us to navigate the complexities of supporting our customers with integrity and purpose.”
Julie Mount | A/Executive Director, Program Delivery
Julie has worked at HSS for over 14 years, with seven of those years as the Director of Applications (HIN) and subsequently Program Director for the HSS Peel Health Campus program.
She has extensive program delivery and ICT experience, leading the implementation of HSS ICT for the Perth Children’s and Fiona Stanley Hospitals and delivering the Digital Information Security and Laboratory Information System programs.
Prior working in the WA Health system, Julie worked in the defence and telecommunications industries, managing software development projects with teams around the world (India, USA, Singapore and China) and established the Motorola Australia Software Centre in WA as part of their global Software Development team.
Carolyn Peel | A/Executive Director, Customer Experience
Carolyn joined HSS in 2018 and implemented the inaugural HSS Contact Centre. She went on to act as the Executive Director, Customer Experience during our State’s response to COVID-19, and more recently has been the Director, Payroll Services.
With an extensive background within the energy and finance industries in senior management roles, Carolyn’s passion has been paramount to meet and deliver customer service across many aspects of HSS.
"Our commitment is to continuously improve and deliver a great experience for our customers by living our HSS value of ‘We put our customers at the heart of what we do’."
Chad Martino | A/Executive Director, Transformation and Strategy
Chad has worked in the WA public sector for the past 16 years, including six years in a senior executive role at the Department of Health.
He is a current member of the WA Health Executive team and brings a wealth of knowledge and experience across diverse portfolios, in particular Government and stakeholder relations.
“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.”