Grennier Law, PC has also handled a wide variety of IRS and State tax cases. Our mission is to protect you against the fiercest collection agency of all time, the IRS. We offer a variety of options to resolve tax situations. Find out why getting a tax resolution can save you a lot of money. At Grennier Law, PC we cover a wide range of personal injury cases. Car accidents happen every day. If you have recently experienced one, you may be shocked by the amount of time and money wasted on hospital visits, auto repair shops, and insurance companies.