Who We AreLeff Law Firm, L.L.P. is a general practice law firm representing clients throughout eastern Iowa. Leff Law Firm was established in 1929 as a firm built on trust. Our lawyers work hard every day to honor the Leff Law Firm reputation. We serve clients throughout eastern Iowa, including the counties of Johnson, Linn, Cedar, Iowa, Washington, Keokuk, Muscatine, Scott, Benton, Tama, Clinton, Jefferson, Henry, Des Moines, and beyond.