The Neill Group (TNG) operates New Zealand’s largest nationwide network of licensed private investigators and legal document servers in Wellington and throughout New Zealand.

TNG (The Neill Group) - Professional Services

TNG specialises in the investigation of theft, fraud, infidelity and other sensitive matters. Need assistance? Struggling with a difficult situation? Don’t risk getting into legal difficulties by trying to find the truth alone. TNG has the professional experience to answer your questions quickly, easily, and with discretion.

We suggest clients only instruct qualified and licensed Private Investigators who are current members of the World Association of Detectives (WAD) or the New Zealand Institute of Professional Investigators (NZIPI).

Dion is Wellington’s longest serving licensed Private Investigators and one of New Zealand’s most qualified and experienced Investigators, Security Specialists and Risk Management Consultants. TNG provides cost-effective and highly professional investigation services that are tailored to meet your requirements.

At TNG, we focus on cost-effective, professional investigations and gathering evidence that will pass the scrutiny of the court and legal process.

Our private investigation services, include, but are not limited to:

Domestic or Personal Investigations

  • Infidelity (suspected cheating partners)
  • Surveillance
  • Locating family members
  • GPS/Vehicle tracking

Legal Investigations & Support Services

  • Criminal defence
  • Civil litigation support
  • Process serving
  • Tracing
  • Interviews
  • Scene examinations
  • Forensics

Commercial Investigations

  • Fraud, theft and dishonesty
  • Covert (undercover) operations
  • Computer forensics
  • Bug sweeping
  • Trademark & IP inquiries
  • Covert cameras
  • Security consulting

Private Investigations

Our Wellington and New Zealand based private investigations are conducted with the highest level of discretion and professionalism. We use modern technology and investigative techniques to complete our tasks with formidable expertise. Every case we undertake is treated with the utmost sensitivity. We appreciate that you are sharing your most private and sensitive matters with us and therefore we guarantee our clients 100% confidentiality.

Child & Youth Investigations 

We provide surveillance to determine what happens when a parent or caregiver is with their child. We can confirm if a parent or caregiver engages in activities that would directly affect a child’s welfare. Formal evidence provided by our Private Investigators is widely accepted for custody and child protection matters in the family court.

Insurance Investigations 

As a licensed private investigator and former certified fraud examiner, Dion Neill has over three decades of experience investigating insurance claims throughout New Zealand. Injury and disability insurance claims can amount to substantial amounts of money which sometimes requires validation prior to any compensation or payment being made to ensure the entitlement is correct.

No matter what kind of insurance you are dealing with – health, property, fire, etc – TNG can assist. From verifying statements to scene examinations and evidential analyse, you can count on TNG to scrutinise any suspicious claims.

The data we uncover can be delivered to you in any way you need, with attention to the demands of each specific case. As professional insurance claim investigators, TNG presents a fresh and new perspective.

We can assist you to confirm the validity of insurance claims or to investigate a claimant is misrepresenting the facts – when your company needs evidence and facts for additional context during verification of a claim, TNG can help.

Our general insurance investigations cover all major types of insurance claims; accident, medical, vehicle, property, fire, and business insurance. If you suspect foul play, TNG can help ensure you make the most informed decision possible.

Corporate & Commercial Investigations 

TNG offers corporate and commercial clients comprehensive investigative services to gather evidence and safeguard your business interests. We understand how important it is to be aware of privacy breaches regarding clients, we investigate with professionalism, keeping your assets, people, information and relationships safe.

TNG Private Investigators can uncover the truth of your situation, and advise you on how best to proceed from there, no matter what you’re dealing with. Our professional licensed private investigators can assist you with any concerns, including theft, fraud or general misconduct cases.

If you need help with suspected crime in your business, TNG’s surveillance operatives can help you to mitigate risk and manage your situation.

Fraud & Theft Investigations

Fraud inside a business or organisation frequently occurs through poor internal controls and processes, this allows a window of opportunity for people in positions of trust and responsibility to carry out offending such as theft or fraud. We have earned an outstanding reputation for carrying out professional investigations on behalf of insurance companies, organisations and business owners.

Drug, Alcohol & Substance Abuse Investigations

Do you suspect your family member, partner or employee maybe using excessive alcohol, taking drugs or illegal substances? Did you know that if drugs are used on your property, you can be prosecuted for their criminal activity. Alcohol and drug abuse is known to be the source of criminal activity and the foundation of anti-social behaviour. Our alcohol, drug and illegal substance investigations will help to provide the answers you are seeking.

Physical or Psychological Abuse Investigations 

Is someone in your life a possible victim of physical or psychological abuse? Our private investigators will provide the evidence to help protect you and your loved ones. The factual evidence provided by our private investigators are often used for the basis of a complaint to police.


Surveillance is a powerful tool used in investigations where evidence is obtained in order to secure prosecutions – substantial intelligence is often gained from these operations. The current measures of surveillance and intelligence gathering include insurance claimant surveillance, domestic related surveillance and surveillance for theft or fraud related investigations.

Surveillance is the specialised craft of following and observing a target. It may sound easy, but it’s a highly specialised line of work, for a number of reasons. First of all, surveillance is a tool with many applications, and is often going to be the best course of action for a variety of problems. The target could be an individual, a group, a vehicle, or even another non-human asset. Being able to adjust for the wide range of potential targets is a key cornerstone of the art.

In the vast majority of surveillance cases, it’s essential to the client for the target to be unaware that they’re under surveillance. This is the second major cornerstone of successful surveillance, and TNG is able to fully ensure confidentiality, caution, and prudence.

Surveillance is a common element as part of many private investigation services, including corporate and commercial investigations, insurance fraud investigations and infidelity (suspected cheating partner) investigations. You may also need surveillance services for GPS tracking of equipment, property or vehicles, installation and/or maintenance of covert camera systems, and more.


Some people intentionally go missing because of illnesses like anxiety and depression. Others go missing when they become a victim of a crime. Our private investigators are highly resourceful, we use a range of proven investigative services like field calls along with online data mining to gather information on a person’s whereabouts.

Depending on how much information you have, and how long they have been gone, locating missing persons can be much faster than some might think. In many cases, contacting us and making use of our networks, contacts and databases will help you find the person in question faster than you’d expect.

Other cases can be much more challenging – when a missing persons case isn’t a simple database job, it can take significantly more effort to find them. This is especially true if a party is involved that wishes to stay hidden.

Trade Mark & I.P. Infringements 

We are often instructed by legal firms to investigate infringements of branding, international copyright and trade mark patents along with the unauthorised use of logos and theft of intellectual property. Dion Neill has personally carried out extensive trade mark and I.P. investigations for a number of leading brands, including: Adidas, Armani, Microsoft, Nike, Playboy and Sony PlayStation.

Legal Support

Being a private investigator doesn’t always mean taking covert photographs or carrying out surveillance on cheating partners. The team here at TNG work with barristers, solicitors and legal teams to obtain evidence, interview witnesses and serve legal documents.

TNG has over three decades of experience supporting the legal sector – leaving no stone unturned, we quickly uncover the truth and confirm the facts. Our knowledge of New Zealand law is thorough and reliable.

Whether it’s assistance with a criminal or civil case, we can help

Process Serving (Legal Document Serving) 

TNG are New Zealand’s leading nationwide providers of document serving and para-legal support services. TNG serves all New Zealand and international legal process, including dissolution of marriage documents (divorce proceedings), court proceedings and a diverse range of documents in the greater Wellington region and throughout New Zealand, including: Auckland, Wellington and Christchurch.

TNG has been professionally serving legal documents and court proceedings across the greater Wellington region and throughout New Zealand since 1987!

TNG serves New Zealand district court, family court and high court proceedings along with summonses, demand notices, eviction notices, trespass notices, dissolution of marriage applications and time critical documents.

TNG operates an extensive network of experienced process servers (legal document servers). Our regional based process servers will serve your legal documents and court proceedings anywhere in New Zealand from Kaitaia to Bluff!

Our process servers use their local knowledge to serve documents across every district and region of New Zealand. This valuable insight provides a beneficial edge in carrying out instructions with efficiency using decades of gathered intelligence.

With the very latest technology, clients monitor every step of the service process directly from the field. Our software provides clients with accurate reporting and transparency across all document and legal process serving activities.

New Zealand & International Services

TNG and Protective Services are based in Wellington with a nationwide network of licensed field agents, private investigators, security specialists, surveillance operatives and process servers (legal document servers) in every district and region of New Zealand, including:

Northland, Whangarei, Auckland, Wellsford, Warkworth, Orewa, Albany, Takapuna, Mangere, Manurewa, Pukekohe, Coromandel Peninsular, Thames, Waihi, Whangamata, Whitianga, Waikato, Hamilton, Te Awamutu, Cambridge, Huntly, Morrinsville, Matamata, Putaruru, Tokoroa, Otorohanga, King Country, Taumarunui, Te Kuiti, Waitomo, Bay of Plenty, Tauranga, Te Puke, Whakatane, Kawerau, Opotiki, Rotorua, Taupo, Turangi, Murupara, East Cape, Gisborne, Tolaga Bay, Tokomaru Bay, Ruatoria, Te Kaha, Taranaki, Wanganui, New Plymouth, Stratford, Hawera, Waitara, Inglewood, Manawatu, National Park, Waiouru, Taihape, Palmerston North, Marton, Bulls, Feilding, Ashhurst, Foxton, Horowhenua, Levin, Otaki, Kapiti, Waikanae, Paraparaumu, Paekakariki, Wellington, Plimmerton, Porirua, Tawa, Johnsonville, Upper Hutt, Lower Hutt, Wainuiomata, Hawkes Bay, Wairoa, Napier, Hastings, Havelock, Waipukurau, Dannevirke, Wairarapa: Featherston, Pahiatua, Masterton, Carterton, Greytown, Tasman, Nelson, Blenheim, Picton, Motueka, West Coast, Westport, Greymouth, Hokitika, Wanaka, Queenstown, Twizel, Alexander, Te Anau, Canterbury, Christchurch, Kaikoura, Ashburton, Southland, Timaru, Oamaru, Dunedin, Invercargill, Balclutha, Mossburn, Gore.