Private Investigator in Oak Brook, Il

Top Reviewed Private Investigation Firm in Oak Brook, IL

Domestic, Corporate, & Litigation.

Lawrence Ryan Reviews

Effective Investigation Services

Technology, knowledge, and experience are our tools.

Lawrence Ryan Investigations brings to bear a full complement of professional detectives and investigators that are experts in their respective investigation fields. Our firm has been proudly serving customers for over 40 years and has consistently delivered results.


Being an excellent private investigator requires continuous training and learning. Investigative techniques and technology are constantly evolving to keep pace with increasingly sophisticated bad actors. LRI trains its team consistently to ensure we never fall behind.


Contact LRI today to discuss your situation and how we can help deliver the results you need. We are the best private investigator firm in Oak Brook.

Private Investigators FAQs:

What areas do you serve?

Lawrence Ryan Investigations is both proud and humbled to be the best-reviewed private investigative firm in Chicago, Illinois. No firm knows Illinois as we do after over four decades working the state. However, our team has experience and reach acquiring information across the United States and internationally. Our Oak Brook private investigator services are based out of our Northbrook Office.


What types of cases do you manage?

LRI manages a wide array of cases. Our firm has the knowledge, tools, and technology to manage just about any type of case efficiently. In our years in business, the most common cases include child custody, insurance fraud, divorce, missing person, background checks, etc. Though these cases are common, each case requires its own approach, methods, and solutions. 


When are you available?

Our team is available around the clock, 24 hours a day, 7 days a week. Investigations don’t usually follow business hours, so neither do we.


Why hire Lawrence Ryan Investigations?

We are the best private detective and investigator firm in Chicago for a reason, we deliver results. Our experience in multiple fields including criminal defense, law enforcement, and corporate investigations gives us the versatility to handle a large variety of cases effectively. Whether you are an individual, a business, or a legal firm looking for litigation support, we’d be happy to help you. Our team is hand-picked, meticulously trained, and equipped with state-of-the-art technology and tools to handle address even the most difficult cases.

Experience and Professionalism

Our team of elite private investigators will relentlessly work to obtain the answers you need.


All of our expertise and industry-leading technology are at your disposal to expeditiously address your case.


If you are in need of private detective services in Oak Brook or throughout the United States, our qualified team of professional investigators is prepared to handle your case and get the answers you’re looking for.


Contact our team of licensed investigators and let’s discuss your situation and your needs to determine how we can help.

A+ BBB Rating Private Investigators in Glencoe, Illinois

Top Pro

Investigators Toolbox

Utilizing our tools and expertise, we know how to carefully retrieve the information that our clients need to achieve their desired results.

Asset searches, background checks, surveillance, and tracking are just a fraction of our private investigation firm’s services. Each case is unique and requires its own methods. Our team is well trained and knows how to retrieve the required information in the most efficient manner.

LRI assures you results. We are more than happy to meet with you and help you get all the details. 

Asset Search

Advanced Background Checks

GPS Tracking

Skip Trace

Facts About Oak Brook, Illinois

Oak Brook is a village in DuPage and Cook counties in the U.S. state of Illinois.
  • Oak Brook has a total area of 8.31 square miles
  •  8,016 people and 2,939 households
  • The median income for a household in Oak Brook is $132,389


Common Cases We Work in Oak Brook

Our investigations portfolio is diverse across all locations throughout Chicago, but in Oak Brook, we see a higher rate of these types of cases:


  • Background Checks
  • Asset Searches
  • Mobile and Computer Forensics
  • Divorce Investigations
  • Skip Trace (locate someone)
  • Fraud Investigations
  • Business Investigations
  • Obtaining phone number or other personal data


Though those types of investigations are common, we offer more services than those listed above. If you require something a little more custom, contact us to discuss your unique needs. Have the best Oak Brook private investigation firm working in your case.

In some situations, we’ve been able to achieve results in only a few hours. Every case is different and requires analysis and investigative methods to obtain results. Contact us today so we can discuss how we can assist you.

Uncommon Approach to Private Investigations

We are the top reviewed private detective agency in Chicago for a reason. We get results quickly.

Call to learn your options.

BBB Accredited Business

Thumbtack Top Pro