The firm now known as The Sack Law Firm P.C. was formed in July of 1992 when Jim Sack, his legal assistant and his secretary left the Washington, DC office of a large Minneapolis law firm to set up Sack & Associates, P.C. The principal motivation in forming the firm was the belief that large law firms do not do generally a good job of servicing their clients unless the clients have "big matters." Work on smaller matters is often given a low priority and results in dissatisfaction by the client in most cases.

Since 1992, the firm has become a group of seasoned professionals who are able to deal with a wide spectrum of legal problems in an efficient and personal manner. The firm represents a wide variety of business and individual clients. In many cases the firm serves as outside general counsel to those clients, sometimes with the title and sometimes not, but in all instances the firm helps the clients manage their legal affairs.

The firm's office is located just outside of Washington, DC in the Tysons Corner section of Fairfax County, Virginia, but many of its attorneys also practice in Maryland and the District of Columbia. The firm's transactional practice also involves clients throughout the United States.

The firm's practice involves representing a diverse set of clients in the areas of commercial and residential real estate, general business advice, tax, trusts and estates and commercial litigation.