Few subjects are as important to IP practitioners as the ethical considerations involved in the representation of clients when potential conflicts of interest arise. Anthony Lo Cicero of Amster, Rothstein & Ebenstein discusses the Rules of Professional Conduct (and the corresponding ABA Model Rules) that apply to conflicts of interest involving current clients (Rule 1.7) and former clients (Rule 1.9); the identification of the client (Rule 1.11); the formation and termination of the client relationship (Rule 1.16); and other subjects. Also covered: the decision in Maling v. Finnegan, Henderson, SJC 11800 (Mass. 2015), which rejected an attempt to create a conflict of interest situation where a firm prosecutes patents of similar subject matter for different clients.