Chief Walter Zalisko
Walter Zalisko


Global Investigative Group's president and principal investigator, Walter Zalisko, is one of the most respected investigators in the industry. Walter, is a retired Chief of Police, decorated police detective, and County Undersheriff, who has over 40 years of experience delivering results and value to clients. Walter was responsible for investigating and supervising felony crimes in a high crime urban New Jersey/New York City area. 


In the private sector, Walter served as a Director of Security for a New York Fortune 400 company where he managed security and investigations involving theft, financial fraud, due diligence, federal compliance, employee conduct, trademark infringement, and background investigations.


As a private investigator, Walter now oversees a variety of investigations, which include, criminal defense, personal injury, insurance claims, and financial fraud. 

Walter's career accomplishments include:

  • Lead Advisor, US Department of State international police training programs where he taught investigative techniques and police operations in Eastern Europe.

  • Consultant to police agencies nationwide.

  • Media law enforcement and investigative expert - FOX, NBC, ABC, MSNBC, Court TV, and print media.

  • Investigated high-profile cases and recognized by one of the world's foremost forensic scientist, Dr. Henry Lee. 

  • Qualified as an expert in Florida and New Jersey Courts. 

  • Elected Executive Board member for the Florida Association of Licensed Investigators (FALI).

  • Florida Board Certified Investigator.



Global Investigative Group, LLC provides a wide-range of investigative and security consulting services. We are a proud US privately owned and operated agency of professional investigators, who are state-licensed, insured and board certified in several highly specialized areas. Since 1998, our clients have relied on our investigative expertise to ascertain the truth.

Our investigators are career professionals carefully selected from the fields of federal, state and local law enforcement, and corporate investigations. With a network of national and international investigators, we are ready to serve our client's needs worldwide. 

Clients turn to us because of our professional services, affordable rates and commitment we bring to each relationship. We believe that our success is attributed to our ability to build long-term and trustful relationships with our clients and providing them with results that are better than they expected.

Our international experience includes working with American and Eastern European law enforcement agencies and NGO's to investigate human trafficking; and developing initiatives to address the problem of trafficking in women and children. Walter is recognized as one of the foremost authorities on Russian Organized Crime and Trafficking in Women and Children. He has investigated human trafficking and presented testimony to the United States Congress and New Jersey Commission of Investigation. His investigations have been chronicled on national television and print media, and are included in the William J. Clinton Presidential Library.  

Year-after-year, business leaders recognize Global Investigative Group as a top-rated investigative agency.


"We could have never proven insurance fraud if it were not for your surveillance program and detailed reports."

Mark H., Insurance Claims Adjuster

"Your investigative work made all the difference in the world for my client."

Lanitra, S.M., Attorney-at-Law

"I find that Global's team are the most knowledgeable, resourceful and effective PI's nationwide. As an attorney, I work with PI's in various states, Global Investigative Group is my go to PI firm for thorough results."

Claudia V., Attorney-at-Law

"I want to thank you for taking time to meet with us and writing such an accurate and amazing report that helped us win our case. We are extremely grateful."

Alex, D., Claimant