About Us Throughout our rich history, from its origin in 1871, Hill Devendorf, P.C. has been dedicated to providing the highest quality legal counsel and services to the area's corporations, municipalities, and individuals. As the oldest and largest law firm in St. Clair County, our dedication and practical application of the law has earned us the trust and respect of our clients, and given our firm a reputation of integrity and distinction. Since our beginning, representation of clients in matters of business law and estate planning has been a central emphasis. Today we feature an array of services, including the emergence and administration of business, labor, and employment law, municipal law, health, tax, pension and employee benefits, commercial and real estate law, probate and litigation.