Licensed Professional Investigators Business ~ Domestic ~ Legal Support At Signature Investigations Group, we realize that your needs come first. We obtain the information that will bring out the truth. We assure you that your privacy is of the utmost importance and all information will be kept strictly 100% confidential. If you feel we can be of assistance or would like more information on our services, call and speak with one of our licensed private investigators for a FREE consultation. We cover all of Michigan with offices in Grand Rapids, Michigan. We specialize in corporate and domestic investigations, but have a broad spectrum of experience. SIG is a fully licensed, bonded & insured surveillance and professional investigations firm. We were founded on the principles of professionalism, integrity, dedication and honest reporting. These values lead our investigations. You have our Signature on it. Please feel free to email or call us anytime at: (616) 466-4274.