Private Investigator, Robert G Hanrahan, Since 1956

As a private investigator in Chicago serving law firms and businesses, Robert G Hanrahan, private detective, knows there is always more to the story. It is our job as experienced, highly skilled private investigators in Chicago to uncover the details so you can make an informative decision.

RGH Investigations, owned and operated by Bob Hanrahan, is a full service, licensed, and highly experienced private investigation agency serving the Chicago, Illinois and Chicago area for over 61 years. For over 20 years, Bob Hanrahan and his team of private investigators regularly work on surveillance cases, workman's comp cases, background check and serve papers in Chicago, Illinois and around the country. We serve small and large companies in insurance, automotive, industrial, healthcare and hospitality to name a few. Individuals, law firms and corporates come to RGH Investigations because of our Chicago roots and inherent trust.


Uncover wrongdoing with employees, worker's comp claims, personal injury, theft & undercover investigations.

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Witness Interview

Find & interview witnesses that persudes & reveal information that may be instrumental to the criminal case.

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Process Serving

Specialize in serving papers to difficult to serve & evasive individuals for the legal and business communities.

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Background Checks

Gain insights into a person's character, professional and personal history. Hire or do business with the right person.

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RGH Investigations has years of experience in court, validating insurance claims as well as helping individuals with personal issues such as locating people, and asset location. Our reputation for comprehensive investigative work is deep rooted, stemming from well-known private investigator, Edward R. Hanrahan, Bob's father. Our investigations are timely, proficient, discrete and results oriented.

All of our private investigators are highly experienced keeping matters strictly confidential. We have led investigations in areas such as witness statements, interviews, photographic evidence, locates, financial investigations, due diligence, trademark, background check, pre-trial, liability, subpoenas and more. Each case will have Bob Hanrahan, a 35 year veteran private investigator supervise, to ensure the details of the case are completed accurately. Be sure to view our latest blog post.