This law office was founded by John Kalmbach who began his practice in 1910, after serving in the Michigan Legislature. Mr. Kalmbach represented a variety of clients and commercial interests in Chelsea, including banking, milling, manufacture, and trade, centered around this intersection of railroad and transportation. The Village always had at least two banks, except for the Great Depression.

John P. Keusch, a native of Chelsea and graduate of the 1933 Michigan Law School, initially served as an assistant attorney general to the United States Department of Interior. In 1937 due to Mr. Kalmbach's ill health, Mr. Keusch returned to Chelsea to take over the practice, and he continues to this date with the firm.

In December 1968 he was joined by Peter C. Flintoft, also a Chelsea native and a graduate of Northwestern University and the Michigan Law School, as the firm of Keusch and Flintoft. Patrick J. Conlin, Jr., of Ann Arbor/Chelsea, a graduate of Notre Dame and Wayne State Universities joined in 1998. Of counsel to the office for a number of years have been Diana R. Newman, a native of New York, and graduate of Fordham Law, and Laurie S. Longo, appellate counsel, a native of Detroit and graduate of the Ohio State University Law School.

The firm has always had its offices at the intersection of Main and Park Streets, across from the 1901 Chelsea State Bank building which now houses the14th District Court, within the historic commercial area.

The law firm represents commercial, private, and municipal clients in a variety of matters. In the current years of practice, litigation has centered upon real estate, business, tax, construction, zoning and family law in the various Federal and State Trial and Appellate Courts, and. The firm regularly appears weekly in the Circuit and District Courts of Washtenaw County and very frequently in the Courts of surrounding Counties, including Jackson, Livingston, and Ingham.