The Neill Group (TNG) is a Wellington based agency providing a range of nationwide services from process serving and private investigations to specialised security and risk management throughout New Zealand.

TNG utilises the unique skill set and operational experience of associates sourced exclusively from the military, intelligence and law enforcement community.

TNG is the agency preferred by barristers, solicitors and legal firms throughout New Zealand because of our results and level of service. The team at TNG welcomes the opportunity to solve complex problems and assist people to achieve their objectives.

Professional Services

  • Surveillance
  • Field Services
  • Legal Support
  • Asset Recovery
  • Repossessions
  • Risk Management
  • Specialised Security
  • Close Personal Protection
  • Corporate Investigations
  • Commercial Investigations
  • Private or Personal Investigations
  • Process Serving (Legal Document Serving)

Is your New Zealand security provider or private investigator qualified and licensed? The New Zealand security and private investigation industry is well known to attract unethical and unprofessional operators with questionable integrity.

Not all New Zealand security and private investigation providers are created equal, we urge prospective clients to only employ a licensed security provider or licensed private investigator with recognised qualifications and a proven track record of relevant operational experience.

TNG suggests clients only instruct members of the World Association of Detectives or New Zealand Institute of Professional Investigators.

When you’re looking for evidence or intelligence, there’s no substitute for experienced Private Investigators. Hiring a Private Investigator (PI) can save you countless hours, significant costs and the disappointment of knowing you missed your chance to learn the truth.

Private Investigators know where to look and how to gather the evidence you need. Always choose an experienced Private Investigator who has successfully dealt with your type of matter before – you don’t want to be a test case!

It is vital that an investigation is tailored to suit your particular circumstances. Ensure you choose a Private Investigator who communicates with you effectively and understands your goals clearly. Through communication and planning, you can be guaranteed absolute discretion and the best possible result.

The expertise we offer to law firms and businesses is at your disposal too and at a very competitive rate. No matter the size of the assignment or how unique your problem, TNG will endeavour to help.


The Neill Group was founded by Dion Neill, a former member of the New Zealand defence forces and emergency services. Dion has over 40 years of service with St John and the Wellington Free Ambulance, he is also a volunteer first responder.

Dion was certified as a fraud examiner with a Diploma of Security and Risk Management (Australia). Dion has earned a number of recognised credentials including a certificate in investigation skills from the Royal New Zealand Police College.

In the late 1980’s, Dion was employed to investigate a major theft within a high-profile business. As a result of Dion’s evidence, over 20 offenders were convicted in the High Court of New Zealand (Dion survived cross examination by the late Mike Bungay QC).

Dion was also one of the first licensed private investigators to carry out assignments for the ACC. Dion featured on the TVNZ series, ‘Private Investigators’ and was interviewed on the TV One Breakfast programme regarding protecting high profile people.

Government Licensing

The Neill Group is the approved trading entity of Dion Neill  who is government licensed as a private investigator, security consultant, repossession agent, personal security guard, property security guard, crowd controller and confidential document destruction agent.

The Neill Group only engages agents, associates and contractors for private investigation, security and repossession assignments who hold a current licence issued by the Ministry of Justice (Private Security Personnel Licensing Authority).

Professional Memberships

Dion Neill is a current member of the following professional organisations:

  • ASIS International
  • World Association of Detectives
  • New Zealand Security Association
  • New Zealand Credit & Finance Institute
  • New Zealand Institute of Professional Investigators (Executive Committee Member)


Our agents must sign a confidentiality agreement prior to deployment on any operational assignment. Trust is an important element of our client relationships and our agents understand the seriousness of breaching this agreement. Our agents and associates have experience working within confidential environments and respect client privacy.

Field Visits 

A visit by a field agent has proven to be an effective way to re-engage with clients or debtors and to ensure compliance of legal obligations. The Neill Group provides nationwide field services to a number of commercial clients with exceptional feedback regarding the execution of our services.

The Neill Group will not engage in any repossession activities that includes the repossession of household chattels or personal property used as security on loan agreements or lending contracts.

Private Investigations 

Licensed private investigators are also commonly referred to as PI’s, Private Eyes or Private Detectives. Our licensed private investigators are typically employed by  private, commercial and governmental clients to investigate theft, fraud, workplace dishonesty and sensitive personal matters.

The Neill Group carries out private investigation assignments in the greater Wellington region and across New Zealand using only experienced forensic experts, private investigators, certified fraud examiners and highly trained surveillance operatives.

The Neill Group utilises the unique skill set and operational experience of former police qualified detectives for all private, commercial and government investigations. At TNG, our core values of integrity and professionalism are the foundation of our success. Our aim is to provide our clients with reliable and comprehensive information which is delivered in a timely and cost-effective manner.

Our licensed private investigators are highly skilled, resourceful, discreet and committed to achieving the best possible outcome. We have the necessary experience to meet your private investigation needs. Our team will strive to obtain a result that exceeds your expectations. Our team is committed to helping customers resolve their issues.

Specialised Security 

Protective Services works in collaboration with The Neill Group to provide high-level specialised security, personal protection and risk management.

Protective Services provides clients with professional security for VIP events, private functions and corporate meetings along with the personal protection of visiting celebrities, film talent, sports teams, corporate executives, court witnesses and high-net worth individuals.

Visit the website of Protective Services 

TNG Process Servers - Legal Document Serving - Wellington - New Zealand

Process Serving (Legal Document Serving) 

TNG are New Zealand’s most experienced and cost-effective nationwide process servers. TNG serves legal process, court proceedings, dissolution of marriage (divorce) applications and a range of time-critical documents in Auckland, Wellington, Christchurch and throughout New Zealand.

TNG are authorised to serve New Zealand Court documents pursuant to Section 25 (1) of the Summary Proceedings Act 1957. TNG are also approved to serve charging documents and criminal proceedings on behalf of government agencies.

Dion Neill served his first legal document in 1986. Our extensive network of regional based process servers utilise their local knowledge to serve documents across every district and region of New Zealand from Kaitaia to Bluff. This valuable insight provides a beneficial edge in carrying out instructions with a high degree of efficiency using decades of gathered intelligence.

New Zealand & International Services

TNG are based in Wellington with a nationwide network of Field Agents, Private Investigators, Security Professionals 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.