As the management team, we look forward to you getting to know us.

We see our roles as supporting the One Tree Defence Childcare Unit staff to deliver the best services for your families and communities.

We invite you to keep in touch with us and want to be a part of your community.

Karri Hillier

Chief Executive Officer

BA(Training and Organisational Development)
Cert IV Workplace
Training and Assessment

Karri has over 25 years in management positions in the not for profit sector and five years as a strategic planner and business consultant. Working with organisations experiencing barriers to success and facilitating organisational development is where much of Karri’s experience lies.

Coral Callan

Executive Director

Graduate Certificate in Management
Currently completing MBA Diploma (Children's Services
Cert IV (workplace training & assessment)

Coral has 8 years' experience working with One Tree and 25 years' experience in the children's services sector in not-for-profit and government agencies nationally.

Tania Iezzi

General Manager Corporate

Bachelor of Arts

Tanya comes to us with over 20 years senior management experience within the outsourced Customer Loyalty environment. She is a trained internal auditor and has projected managed the attainment of the ISO accreditation.

Claire McManus

General Manager Children's Services

BA (Child Psychology and Education),
BA Hons (Anthropology),
Dip (Children’s Services),
Cert IV (Workplace Training and Assessment),

Claire is a qualified early childhood teacher and child psychologist with a postgraduate degree in anthropology. She has worked with One Tree for five years, managing a 112-place child care service in Karratha and a community hub in Roebourne before moving to Melbourne this year to lead One Tree’s operations in Victoria.

Lorensz Senn

General Manager Finance


Lorensz has considerable experience spanning financial and corporate services across private, government and community service industries.



The Defence Childcare Program is designed to provide childcare to Defence personnel families and local communities.
If you want to enrol your child into a long day care, which include intergrated kindergarten programs please visit our services page at
We have One Tree Defence Childcare services across Australia. Please choose the state you live in to see a listing of services for that state.
The One Tree Defence Childcare Unit also offers out of school hours care and vacation care in some areas.
Defence families that need help in finding a long day care, out of school hours care or vacation care can get assistance from our Individual Case Management (ICM) service.
The link to the ICM page is: