+61 2 8091 6826info@guardianinvestigators.com.au

World-Class International Private Investigators in Australia

Guardian Security and Investigations Pty Ltd takes pride in providing high-quality professional investigative and security services in Australia, led by our CEO and Director, David Mandrake. With over three decades of hands-on experience in the investigation industry as an American private detective, David is a licensed New South Wales and Queensland private investigator and security professional. His vision is to assist every client who seeks our services in finding answers to their questions, resolving concerns, and addressing security-related issues. Are you in search of a seasoned and talented private investigator in Australia? Are you in need of unparalleled and discreet surveillance services? If suspicions of infidelity, employee theft, or corporate espionage are keeping you awake at night, it is time to engage the services of a highly skilled private investigator from Guardian Security and Investigations Pty Ltd.
+61 2 8091 6826

Comprehensive Solutions for Your Security and Investigation Needs!

Guardian Security and Investigations Pty Ltd is committed to providing comprehensive services that help individuals and businesses protect themselves, their interests, and their assets. With a track record spanning over three decades, we operate with the utmost professionalism, ethics, and legal accountability to gather the crucial information our clients require. Through effective verbal communication and clear, concise written reports, we deliver actionable results that empower our clients to make informed decisions. With a strong focus on excellence, we take great pride in offering comprehensive investigation services across major cities in Australia. What sets us apart is our global reach, extending our expertise from Australia, New Zealand, and the United States, to other foreign jurisdictions through our strategic alliance with international private investigators.
Surveillance
When you engage our services for surveillance, our licensed private investigators meticulously assess your specific requirements and design a tailored strategy to achieve the best possible outcome. Employing advanced techniques and leveraging our expertise, we discreetly gather the evidence and information you need to gain valuable insights.
Missing Persons
Our highly trained and experienced private detectives possess exceptional skills and resources to handle complex missing persons cases. With unwavering dedication, we leave no stone unturned in our pursuit to locate missing individuals. Leveraging our extensive network and employing cutting-edge investigative techniques, we aim to reunite loved ones and provide closure in challenging circumstances.
Process Service
As part of our comprehensive investigative services, we offer assistance in serving court papers and navigating the often complex process of locating and serving individuals. Our team understands the legal intricacies involved and possesses the expertise to handle the task efficiently and effectively, ensuring all legal requirements are met.
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Why Choose Us?

Whether you require a simple trust or a more complex strategy involving multiple entities, our highly qualified security consultants are ready to provide the best solutions for your asset protection needs. We are always available to discuss the various services we offer and how they can benefit you immediately.
Our mission is to provide customized investigation services that cater to the unique needs of our clients. Whether you are an insurance company, self-insurer, solicitor, business, or private individual, we have the expertise to assist you. With a deep understanding of the intricacies involved in various sectors, we offer specialized services tailored to each client's specific requirements.
Our investigators get the evidence and proof you are seeking.
Rest assured that all our private investigators in Australia are licensed and possess the highest level of skill in their respective fields. We handpick our team members to ensure they meet our stringent standards of professionalism, integrity, and expertise. By engaging our services, you can expect honest investigations conducted by our dedicated professionals who consistently deliver quality results that align with your needs and budget.
Our investigators are results-oriented specialists who challenge themselves to succeed.
When you choose Guardian Security and Investigations Pty Ltd, you gain a trusted partner committed to your success and security. We take the time to understand your unique circumstances and tailor our approach. Our commitment to transparency and open collaboration ensures that you are actively involved throughout the entire process, providing you with peace of mind and confidence in our services.
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Hire a Private Investigator Across the World

Engage the expertise of private investigators across Australia, NZ, USA, and the rest of the world. When it comes to exposing infidelity, detecting fraudulent insurance claims, or uncovering instances of employee theft, our team of highly skilled private investigators in Australia stands ready to assist you. We value open and honest communication, and we are more than willing to address any queries or apprehensions you may have. Before enlisting the services of a private investigator, it is essential to understand the myriad ways in which our expertise can benefit you.
What Defines a Private Investigator?
Private investigators are professionals entrusted with conducting thorough investigations on behalf of individuals, legal professionals, and businesses. Our licensed private investigators meticulously adhere to state and national laws, bringing their acute powers of observation, astute analytical skills, and honed surveillance techniques to bear on gathering comprehensive information relevant to your specific case or situation.
What Does a Private Investigator Do?
At GSI, our private investigators use high-level investigative skills and tools to unearth buried information about the individual or company our clients want to investigate. In some cases, they use photographic evidence or video surveillance to catch a person in the act. Such evidence is an excellent way to uncover infidelity or expose employee dishonesty.
Through the use of public records and intuitive interviewing, we can identify when a person is lying. Maintaining an ethical approach to our investigative practices ensures the evidence we gather is admissible in court of law or administrative tribunal; thus, the evidence collected can be used in resolving family matters or employment disputes.
What Do You Get from Hiring an Investigator?
When you need proof beyond a reasonable doubt, you can rely on Guardian Security and Investigations Pty Ltd. As a company of licensed investigative professionals in Australia, we carefully manage each case to ensure a successful outcome.
We understand that you may little options to avail yourself in difficult matters. So, we are pleased to be the firm that people in Australia and other parts of the world turn to when they need crucial evidence or information.
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What Our Clients Have to Say

At GSI, our clients' needs always come first. We understand the importance of achieving the desired results while ensuring the utmost integrity and professionalism. Our team of dedicated professionals is committed to working closely with you, providing personalized attention, and keeping you informed throughout the investigative process. You want a private detective agency in Australia with the experience and skills to successfully resolve your issue. Here's what our clients have to say about our services:
Guardian Security and Investigations has come through on every case. Thank you and well done!
Robert C, Business Client
Guardian Security and Investigations is the only firm we trust to handle our complex internal and external investigations.
Ron K, Corporate Client
The only thing I regret is that I didn't call your company sooner. Your investigators were brilliant!
Jessica S, Private Client

Contact Us Today

When you require the services of experienced private detectives, we encourage you to reach out to us without delay. You can contact our dedicated staff, and they will be delighted to engage in a discussion about your specific assignment. Alternatively, if you prefer the utmost discretion of email communication, please feel free to send your requirements or inquiries to info@guardianinvestigators.com.au. Be assured that we prioritize prompt responses and will attend to your emails promptly. Don't hesitate to get in touch with us today to take the first step towards resolving your concerns with the assistance of our skilled private investigators.
02 8091 6826
info@guardianinvestigators.com.au
+61 2 8091 6826
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2/1 Newspaper Place, Maroochydore QLD 4558 19/103 George Street, Paramatta NSW 2150
Please email us to receive the quickest response to your questions and enquiries. We do not have a walk-in service available. In-person appointments must be scheduled in advance.
ABN: 43 615 424 130 NSW Master Security License No. 000103344NSW Commercial Agent No. CAL00011738QLD Security Providers License No. 4768168
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