In the law firmsButler Rubin Saltarelli & Boyd LLP added John O. Leahy as an associate.Leahy practices in complex commercial litigation.He was previously with Sidley Austin LLP.•Dinsmore & Shohl LLP added Daniel R. Flynn as a partner.Flynn, a member of the environmental practice group, focuses on environmental, health and safety issues.He was previously with Leech Tishman Fuscaldo & Lampl LLC.•SmithAmundsen LLP promoted attorneys Thomas H. Hayden III, Yesha Sutaria Hoeppner and Kaylea H. Weiler to …