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ANZ Executive Team

rebecca power - managing director, australia & new zealand

Appointed: 2021

Skills and experience: Rebecca is a seasoned senior executive with significant experience in developing and growing business across the public and private sectors.

Career experience: Rebecca’s most recent corporate role was as the Chief Executive Officer for Tenix Solutions, delivering infringement management services and solutions on behalf of state and local governments across Australia and New Zealand. Prior to Tenix Solutions, Rebecca held senior roles in the telecommunications industry. Rebecca holds a Bachelor of Industrial Engineering from the University of Melbourne.

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Appointed: 2019

Skills and experience: Rebecca is a senior human resources practitioner with extensive experience of employee relations, M&A, change management and generalist HR practises. Rebecca’s experience spans a broad range of industries and jurisdictions. Before joining G4S as the Director, Human Resources and Safety, she was the Head of HR, Energy and Enterprise at Energy Australia.

Career experience: Rebecca’s previous roles include Head of Employee Relations at BAE Systems Australia, Regional People Manager for Qantas Engineering as well as National Employee Relations Manager and Human Resources Manager (Operations) for National Foods.

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Craig Castlle


Appointed: 2019

Skills and experience: Craig has more than 30 years of experience in corrections across a broad range of roles and portfolios. He is responsible for Port Phillip Prison and Justice Prisoner Transport (VIC), Mount Gambier Prison, SAPMICAM Prisoner Transport/Prisoner Management and Electronic Monitoring (SA), Electronic Monitoring (NT) and the District Court Building (WA).

Career experience: Craig forged a career in Western Australia managing the WA Emergency Management Unit, multiple prisons and state-wide operations culminating in the role of Assistance Commissioner Custodial Operations. In 2017, Craig was appointed GM of Port Phillip Prison.

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Neonie Colls


Appointed: 2019 

Skills and experience: Neonie has more than eighteen years experience in the security industry across a diverse range of portfolios. 

Career experience: Neonie has been with G4S since 2015. She started as Branch Manager overseeing security contracts in Western Australia before moving to global contracts in NSW and most recently, as General Manager of Court Services Victoria. 

Current external commitments: Neonie is a member of the ASIS Victoria Executive Committee. 

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Tabitha Mitchell

Tabitha Mitchell - director, business development and sales

Appointed: 2020

Skills and experience: Tabitha leads Business Development, Sales and Marketing across Australia & New Zealand. She is one of the region’s most knowledgeable, experienced leaders in the provision of outsourcing and offshoring.

Career experience: Tabitha brings 25 years’ experience gained from global and local organisations, establishing high-profile outsourcing services to government and commercial industries. At Serco, Tabitha led the Citizen Services Business Development function, helping the business expand market share through the acquisition of high-profile contracts. Tabitha also led Global Sales and Marketing for Redflex Traffic Systems, holding responsibility for end-to-end management of complex government procurement contracts in local and international markets.

Current external commitments: Tabitha is a Board Member and Growth Director for Corsonys a start-up in the medtech business. Corsonys are on a mission to prevent heart disease by empowering clinicians and consumers with cost effective, non-invasive, and easy to use heart health screening technologies.

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