1919 | Delos G. Haynes establishes office in St. Louis for the practice of patent, trademark and copyright law |
1920s | Haynes joins Lloyd R. Koenig to practice as Haynes and Koenig |
1929 | Firm moves from Syndicate Trust Building to Paul Brown Building at Ninth Street and Olive Street |
1930s | John D. Pope III joins the firm |
1940s | Firm renames itself Koenig and Pope |
1945 | Stuart Senniger joins the firm |
1946 | Irving Powers joins the firm |
1952 | Don Leavitt joins the firm |
1968 | Firm moves to Railway Exchange Building |
1969 | John Roedel joins the firm |
1950s-60s | Name changes from Koenig and Pope, to Koenig, Pope, Senniger and Powers, to Koenig, Senniger, Powers and Leavitt, then to Senniger, Powers, Leavitt and Roedel |
1991 | Firm moves to Metropolitan Square Building |
2006 | Firm renames itself Senniger Powers |
2008 | Senniger Powers moves to the Bank of America Tower in downtown St. Louis |
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Early clients of the firm included Mallinckrodt Chemical Works, Bemis Bros. Bag Co. (now Bemis Company), National Vendors, Ralston Purina, Carter Carburetor Co., Eaton Co. and Gemex Co.
Current clients include Monsanto, Maritz, Cookson Electronics, Lincoln Industrial and Covidien.