Executive Leadership Team

Alyssa Duffy
Acting CEO / Senior Conciliation Officer

Alyssa Duffy


Alyssa is a nationally accredited mediator, conciliator and qualified lawyer who commenced her career at Slater & Gordon Solicitors as a personal injury lawyer in 2003. She has also worked at WorkSafe as Legal Counsel before joining the Accident Compensation Act Review and working in legislative reform and implementation.

In 2010 Alyssa was appointed as a Conciliation Officer at ACCS and has been involved in various organisational improvement projects. In 2016, she co-presented a Conciliation course LAW5CON at La Trobe University and has spoken at the National Mediation Conferences in 2012 and 2016. Alyssa is a member of the Resolution Institute and Victorian Association of Restorative Justice.

Alyssa has a keen interest in Workers Compensation, Alternative Dispute Resolution and Access to Justice, and works to ensure that this is reflected in ACCS practices and operations.

Kate Spillane
Deputy Senior Conciliation Officer - Service Improvement

Kate Spillane


Kate has had over 24 years of experience in the Victorian Justice System and has worked in Courts across multiple jurisdictions in Melbourne and Regional Victoria. Most recently Kate held the role of Principal Registrar of the County Court of Victoria and led major reform to improve the services of the County Court Registry. She has won a number of awards across her career, including the One Justice Award for Leading Significant Change. Kate holds a Diploma in Government Court Services from Victoria University.

Marguerite Darmody
Acting Deputy Senior Conciliation Officer -  Legal and Technical

Marguerite commenced with ACCS in 2010 as a Conciliation Officer, and was appointed to the Executive Leadership Team in December 2020. She is a values driven leader, and is a strong advocate for fairness and ethical practice.  As a lawyer in past roles, Marguerite has had extensive experience in Victoria’s statutory compensation schemes through her time with the Transport Accident Commission (TAC) and WorkSafe Victoria's Panel firms.

Marguerite holds a Bachelor of Arts/Bachelor of Laws and a Master in Counselling from Monash University, along with an Australian National Mediator Standards Accreditation from Resolution Institute

Dale Mitchell
Dale Mitchell

Dale joined ACCS in March 2019.  During his career of nearly 25 years in the public and private sector, Dale has held executive management positions including General Manager, Corporate Services and Chief Financial Officer with Victorian public sector agencies.  Dale has been responsible for portfolios such as finance, corporate governance, risk management, information technology, procurement, records management and people and culture.  He managed implementation of key business and financial systems.

Dale is a Certified Practicing Accountant and has a strong understanding of the Victorian governance and financial management framework.  His government experience includes working with the Victorian Health Promotion Foundation, Southern Metropolitan Cemeteries Trust and the Victorian Auditor-General's Office.  Dale is a graduate of the Australian Institute of Company Directors.

John Brennan
General Manager People and Culture


John is an accomplished executive with a career spanning public, private and professional services in areas of strategy, risk, program management and people &culture. He commenced with ACCS in 2020, following various senior executive roles in Victorian Public Sector, including with VMIA and State Trustees, and he has a deep understanding of the importance of public purpose businesses in supporting the lives of Victorians.

John holds a Master of Business, Graduate Diploma Psychology of Risk and is a graduate of the Australian Institute of Directors (GAICD) and the Harvard Business School’s Authentic Leadership Development (ALD).

Denise Von Der Lippe Acting Operations Manager

Denise commenced with ACCS as a Conciliation Officer in 2013, and she was appointed to the Executive Leadership Team in the role of Acting Operations Manager in September 2019.

Denise has over 20 years experience in the workers’ compensation industry, including senior roles with Woolworths and VicRoads. Denise holds a Bachelor of Business from Monash University.