President and Principal Investigator

​Walter Zalisko

Walter, a retired Chief of Police, decorated police detective, and County Undersheriff, 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, fraud, due diligence, federal compliance, employee conduct, and background investigations.


As a private investigator, Walter oversees a variety of investigations, which include, criminal defense, personal injury, insurance and financial fraud, domestic issues, and employee conduct. 

Walter served as a lead advisor for US Department of State overseas police training programs, where he taught investigative techniques and police operations in Eastern Europe; and continues to consult to police agencies nationwide. Walter is frequently mentioned by renowned criminologist Dr. Henry Lee for his investigative skills. In 1993, Walter served as Co-Chairman on a New Jersey Governor's Transition Task Force. 


As an investigative specialist, and police operations and security consultant, he is frequently called upon by media outlets, such as FOX, NBC, ABC, CNN, and MSNBC, to provide expert analysis. Walter has authored several articles in trade publications and has spoken at conferences and meetings. Walter has been recognized for his service by the New Jersey Senate, State Prosecutors, FBI and other investigative organizations.

Mr. Zalisko has been qualified as an expert in Florida and New Jersey Courts. 

Walter currently serves as an elected Executive Board member for the Florida Association of Licensed Investigators (FALI) and as Chairman on the FALI By-Laws Committee. He is a Florida Board Certified Investigator. Walter is also a member of the National Association of Legal Investigators (NALI) and InfraGard, an FBI critical structure partnership. 

Our Agency

Global Investigative Group, LLC provides a wide-range of investigative, executive protection, 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 security programs help protect thousands of people and billions of dollars in assets.

Our investigators are highly experienced 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. We are recognized as the catalyst for human trafficking initiatives in the United States. Well known as one of the foremost authorities on Russian Organized Crime and Trafficking in Women and Children, Walter has extensively investigated human trafficking and presented testimony to the United States Congress and New Jersey Commission of Investigation. His undercover 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 not only claim to be experienced, we are experienced! Our investigators are fluent in Ukrainian, Polish, and Spanish.


"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