Mr. Dinsmore opened a private practice in 1908, and in 1912 he invited Walter M. Shohl,[5] a graduate of Harvard Law School to join the firm.

[8] Seventy three years after the Cox trials, the firm ended up on the other side of Ohio's misapplication of bank funds statute.

Ohio Attorney General Anthony Celebrezze, Jr. appointed Lawrence Kane as special prosecutor to convene a grand jury and investigate the Home State collapse.

[10] Just prior to World War II, the firm handled a top-secret matter for the government: the siting of the Wright Aeronautical Plant on what is now General Electric in Evendale, Ohio.

Attorneys formed companies throughout the world, providing an essential support to the establishment of Procter & Gamble's vast international business in the 1950s through the 1970s.

Additional work involved Dow Corning breast implants, the diet drug Fen-phen, Brown & Williamson tobacco and popcorn flavoring.

The firm continues to serve a large number of companies, from Fortune 500 international conglomerates to small businesses, non-profit organizations and entrepreneurs.

In 2014, Dinsmore completed a merger with Peck Shaffer & Williams LLP, a nationally recognized bond counsel firm, to add 35 attorneys and office locations in Chicago, Denver and Covington, Kentucky.

[18] and Leventhal Law [19] to open four additional offices, including locations in Detroit, Michigan and San Diego, California.

In 2021, Dinsmore announced its merger with Wooden McLaughlin LLP in Indiana, adding offices in Indianapolis, Evansville and Bloomington.

[20] In January 2023, Dinsmore announced the expansion of the San Diego office with the merger into the firm of Mulvaney Barry Beatty Lynn and Mayers LLP.