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MSS Security is Australia’s leading trusted security, medical and emergency response company with more than 6,000 highly trained and professional employees.

MSS Security is headed by an executive management team and senior specialists who are responsible for ensuring delivery of high quality, trustworthy and reliable services across Australia. Each of our business divisions across Australia is headed by a General Manager, supported by a team of experienced professionals in all areas of business support and who have full-service accountability and management of their division’s performance, allowing them to provide a locally and personally orientated service.

Mike McKinnon

Vice Chairman, SIS International Non-Executive Director

Geoff Alcock

Managing Director

Don Burnett

Chief Financial Officer & Board Director

Natalie Colosimo

Head of People, Culture, CSR

Penny Sena

General Counsel

Jamie Adams

Executive General Manager, VIC/ TAS, National Operations Centre, Safety, Quality & Systems

Matthew Farlow

Executive General Manager, NSW, Key Clients & Markets

David Cheatham

Executive General Manager ACT and Habitat Security

Trish Sellman

General Manager, VIC

Geoff Merchant

General Manager, SA/NT

Wayne Stone

General Manager WA, Medical and Emergency Services

Lisa Blackburn

General Manager, QLD

Daniel Goodwin

General Manager, NSW

Michael Matthews

General Manager, Defence

Gregory Neyland

Head of Aviation and Emerging Technologies

Sarkis Baaini

General Manager, Key Clients and Markets

Raj Daroch

General Manager, Information Technology

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Mike McKinnon

Vice Chairman, SIS International Non-Executive Director

Mike has been involved in the security industry for more than 20 years and was on the board of ASIAL (Australian Security Industry Association Ltd) from 2010 to 2017.

Before joining MSS Security, Mike was the General Manager, Contracted Security Services Unit at Qantas. As a major user of security services, this role gave Mike an in-depth understanding of the security function from a client’s perspective.

Additionally, he has a wealth of knowledge and experience in security electronic wholesaling, safe manufacturing and distribution, alarm monitoring and electronic solutions. This experience gives Mike an unparalleled insight into all aspects of the security industry.

Geoff Alcock

Managing Director

Leading the MSS Security management team and overseeing a business of over 6,400 employees, Geoff’s proven leadership places particular focus on customer service, innovation and risk mitigation.

Geoff’s committed and collaborative approach fosters a culture of service excellence and is reflective of the positions he has held. Commencing with MSS Security in 2008 as General Manager NSW, Geoff was promoted to Executive General Manager NSW in 2014, and three years later became a member of the Board of Directors. In 2018, Geoff took on the role of Chief Operating Officer, and was appointed Managing Director in April 2019.

Geoff began his working life as an Electrician in the resource industry and has since completed a Diploma in Logistics and a Diploma in Security and Risk Management.

With experience across all market sectors, Geoff has developed a broad skill set where his multi-faceted leadership, ability to influence, and focus on process improvement has been successfully demonstrated.

Don Burnett

Chief Financial Officer & Board Director

Don is a Chartered Accountant in Australia and a Certified Public Accountant in the USA. He is responsible for the financial and commercial function at MSS Security, ensuring the company’s long-term financial stability and ability to continue providing our clients with best practice service.

He began his career at Price Waterhouse and has held senior positions at Henry Walker Eltin and Greater Union Cinemas.

Don has a Master of Business Administration from the Macquarie Graduate School of Management.

Natalie Colosimo

Head of People, Culture, CSR

Natalie has over 20 years of experience in human resources including talent management, performance improvement, industrial relations, and employee relations gained in various industries such as Healthcare, Retail, Government, and Telecommunications.

Natalie was promoted to the role of Head of People, Culture, and CSR at MSS Security in July 2024. With six years of dedicated service, she has held pivotal roles including People & Culture Manager for VIC/TAS and National IR Advisor. Natalie also led the business's HRIMS project, overseeing the successful main rollout and implementation of this essential platform.

Before this promotion, Natalie served as the Acting Executive General Manager for People, Culture, and CSR, stepping into the role in December 2023. Her strong leadership during this period showcased her strategic vision and unwavering commitment to fostering a positive and inclusive workplace culture.

In her new role, Natalie will focus on advancing MSS Security's initiatives in people management, cultural development, and corporate social responsibility. Her dedication to creating a supportive and enriching environment for employees makes her an ideal choice to lead this essential function.

Penny Sena

General Counsel

Penny oversees the legal function of MSS Security and its related Australian entities.

With more than 22 years of legal practice under her belt, she has exposure across a range of service and customer-oriented industries including retail, FMCG, fitness and ICT. Her security experience commenced in the late 1990s when she worked on a project setting up a security franchise on behalf of a large direct selling corporation. She joined MSS Security on a temporary basis from 2012 to 2013 and returned permanently in early 2017 as General Counsel. Penny has also worked for a top 5 legal firm, a government regulator and a number of companies – both private and public – sitting on the leadership teams of four of these.

A results-oriented, pragmatic and commercially focused generalist practitioner, Penny brings with her a wealth of commercial experience across contracts and transactional work, competition and consumer law, corporations law, intellectual property, privacy, dispute resolution, workplace law, compliance, governance and risk management.

Penny holds undergraduate degrees in Law and Social Sciences from the University of NSW and her post graduate qualifications include a Master of Laws, also from UNSW, and a Graduate Diploma of Law from the University of Sydney.

Jamie Adams

Executive General Manager, VIC/ TAS, National Operations Centre, Safety, Quality & Systems

Jamie took responsibility for MSS Security’s Victoria and Tasmania teams in July 2017, following 12 months in the equivalent position in South Australia and Northern Territory.

He has an extensive understanding of the business, having performed in a number of roles since joining MSS Security as our State Manager Northern Territory in 2004, after 15 years in retail management and the financial services sectors. In 2010 he moved to NSW to become State Manager Operational Performance, before relocating to Queensland in 2012.

By drawing on his experience and management exposure within MSS Security nationally, Jamie reinvigorated the south-east Queensland security guarding business and fostered significant relationships in the health, tertiary education and defence industries. He achieved this by focusing on operational and service delivery excellence, and empowering employees.

Matthew Farlow

Executive General Manager, NSW, Key Clients & Markets

Matthew has in excess of 20 years of experience in the security industry with a focus on security operations.

He has experience performing a range of roles including armed positions in the retail security sector with a majority of his experience working in a security supervisory position within our contracts with the Australian Defence Force (ADF).

With a Diploma in Business and having undergone Safety Leadership training, Matthew is able to utilise his extensive knowledge to effectively manage the operational aspects of his role as well as ensure all client expectations are met.

Matthew commenced with MSS Security in 2006 as a security officer and has progressed throughout his career with our business culminating in being promoted from State Operations Manager – Defence to General Manager NSW in 2018.

David Cheatham

Executive General Manager ACT and Habitat Security

David has 13 years’ experience in the security industry, and more than 20 years with the NSW Police Force.

At MSS Security David manages high-profile government contracts using his extensive knowledge of federal government and critical infrastructure security requirements.

He has assessed, analysed and written more than 500 high-risk site assessments, and compiled a 125-page training manual about the lawful, appropriate and correct use of firearms.

David has diplomas in Security and Risk Management, Training and Assessing, and Business Management.

Trish Sellman

General Manager, VIC

As a seasoned professional with over 30 years’ experience in the correctional industry, specialising in managing complex security environments with multiple diverse stakeholders, Trish is known for strategic leadership and operational excellence.

Throughout her career she has demonstrated a deep understanding of both government and private industry landscapes, successfully navigating challenges and driving innovation in security protocols.

She has been recognised for her leadership and contribution to multiple high-profile projects both in Australia and internationally, earning her a reputation as a trusted leader in her field.

As the MSS General Manager Victoria, Trish oversees delivery of security guarding services with a focus on customer service, operational excellence and continuous improvement.

Geoff Merchant

General Manager, SA/NT

With over 15 years of business management experience and a career which has encompassed a number of strategic management and leadership roles, Geoff’s passion and focus on business development and continuous improvement has been evident since his commencement with MSS Security in 2017.

Having worked for multi-national companies such as TNT, Skilled Engineering and Toll Group, has contributed to Geoff’s effective leadership and success in business growth and improvement of service delivery and security solutions.

Geoff is responsible for managing the SA and NT business and the delivery of quality services for his clients. He is supported by an experienced management team and more than 700 security personnel. Geoff has a Diploma in Leadership and Management and a Diploma in Business.

Wayne Stone

General Manager WA, Medical and Emergency Services

Wayne is an experienced people leader with over 30 years of experience in Senior and Executive roles within Government, private sector, and non-for-profit organisations. Wayne began his career working as a Detective within the UK Metropolitan Police and National Crime Squad investigating major crime across Europe and Asia before progressing to Director of the NHS Counter Fraud and Security Management Service.

Since migrating to Australia in 2006 Wayne has progressed his career in several senior roles within HBF Health, one of Australia’s biggest private health insurers, managing their counter fraud division and a $1.8 billion contract portfolio. As an experienced Director for several not-for-profit organisations Wayne brings a wealth of commercial and stakeholder relation management experience both within and outside of the security sector.

Lisa Blackburn

General Manager, QLD

Since commencing with MSS Security in 2013, Lisa has demonstrated her strong operational knowledge across various market sectors throughout our Queensland business.

Lisa’s previous work experience has covered positions across waste and recycling, transport, security and investigations.

Possessing expertise in client management, operations managements and innovation, Lisa is known for building relationships, her customer first ethos and her enthusiasm and energetic approach to everything she does.

Lisa was appointed to General Manager Queensland in 2024, previously her role was State Operations Manager Queensland.

Daniel Goodwin

General Manager, NSW

Daniel has served as a member of the Australian Regular Army and is a highly experienced security industry professional with over 34 years in the security industry in Australia.

Daniel is highly proficient in the areas of operational delivery, client management and risk Identification. Daniel has completed a Diploma in Security Risk Management and holds related NSW Security Industry Licensing.

Daniel has proven results in generating significant and positive outcomes for customers through his highly effective services. He is recognised for building strong, genuine relationships with internal and external stakeholders in doing so providing strong leadership and mentoring.

Daniel was appointed to General Manager New South Wales in 2024, previously his role was State Operational Performance Manager New South Wales.

Michael Matthews

General Manager, Defence

Since commencing with MSS Security in 2014, Michael has demonstrated his strong operational knowledge across a number of sites which has led to an extensive understanding of the business.

With a Diploma in Security Risk Management and Certificate III in Security Operations, Michael’s work experience includes overseeing 400+ staff and has covered positions across aviation, cleaning and security sectors.

Michael was appointed General Manager – Defence in 2018, previously his role was Operations Manager – Defence.

Gregory Neyland

Head of Aviation and Emerging Technologies

Gregory commenced with MSS as Head of Aviation in 2022 and is an experienced security aviation Executive. As a previous member of the Australian Defence Force and with over 18 years’ experience in the security industry. Greg's background includes spanning operations, training, risk, compliance, projects, and asset management.

He has significant experience in technology design, course development, coaching, and training large scale teams and continuously identifies inefficiencies and opportunities to support and boost productivity to deliver best outcomes.

With a passion for learning and continuous development Gregory holds various qualifications including, Advanced Diploma’s in Leadership and Management, Program Management and Work Health Safety.

Sarkis Baaini

General Manager, Key Clients and Markets

With almost three decades of dedicated service with MSS Security, Sarkis epitomises the values and customer service ethos that MSS Security is known for.

Over that time, Sarkis has showcased his versatility by excelling in various roles within the business, from Finance and Administration to State Operations Manager, Business Development Manager, and his current position as General Manager Key Clients and Markets. One of the many highlights of Sarkis’ vast experience was his leadership of MSS Security’s key role in the 2018 Commonwealth Games
Sarkis’ latest role brings together his experience and skills where he is responsible for many aspects of the business including building and maintaining strong relationships with key clients, developing and securing new clients, driving innovations and always ensuring deep customer satisfaction.

Overtime Sarkis has fostered trust with key clients, fostered successful new relationships while laying the groundwork for long lasting partnerships. His journey showcases dedication, innovation, and excellence, reinforcing MSS Security’s commitment to our clients.

Raj Daroch

General Manager, Information Technology

Raj has extensive Information Technology knowledge and experience having worked on many projects in USA, NZ, Papua New Guinea, Japan, and Australia. Dynamic, progressive, and constant changes motivate him, along with new challenges. At MSS Security, he is responsible for ensuring technology and systems are fit-for-purpose, available around-the-clock, and adherence to global information security standards. Raj has a Master’s in Information Systems from University of New South Wales and a Post Graduate Certificate in Cyber Security from Charles Sturt University.