Insurance Tailored For You Here, at Landmark Insurance Group, it is our sole duty to custom tailor a comprehensive package to cover all nuances of risk for your or your business. Landmark Insurance Group, formerly IRG Underwriters, is an independent insurance agency. IRG Underwriters began its operations as an environmental insurance agency in 2002. From the beginning, our focus has been on providing the best service to our clients. We offer prompt, accurate, and expedient care for our clients. It is important for us to build a relationship with you and support you through whatever needs or changes you may incur. Allow us to protect your family or your business, with a specialized custom tailored insurance policy just for you!