Serving clients is our passion since 1997

About Us

Second to none


David Hertog is a recognized expert, an award winning private investigator.

He is a US Army Veteran, F.B.I. trained businessman with a passion for protecting life, gathering competitive intelligence and important information for your confidential business and personal life decisions.  When you need help but don't know what to do next, call (847) 382-4444 today to arrange your meeting.

Learn how to find your own information!


Background Investigations 101 is a great way you take control of your business & personal life.  Learning how to do it yourself with these little known insider secrets and tricks of the trade.  Gain the information you want & need for your future life.  Call us now to set up your consultation.

(847) 382 - 4444

No case is too big or too small!


I've been priviledged to provide services to attorneys, corporations and people I admire.  All with strict attention to confidentially and discretion.  When I handle your matter, we will walk through the snow and not leave a trace.  From individuals dealing with family, marital and personal matters to large multi-national corporations who require protection from terrorist threats and violence inside their workplace, help is what you need and get. 

Contact Us

Schedule a consultation today.

Call (847) 382 - 4444

H. A. I. - A Licensed Private Detective

Mailing Address: 117 South Cook Street, Barrington, IL 60010, US

(847) 382-4444


Monday - Friday: 9am - 7pm

Saturday: By appointment

Sunday: By appointment

Drop us a line!