Tom Mason of Zuckerman Spaeder discusses whether a lawyer can be part of multiple firms and the ethical consequences of multiple affiliations. Topics include: • Those states which permit multiple affiliations and those states which do not, see, e.g. ABA Formal Opinion 90-357; DC Legal Ethics Opinion 338); • The impact on conflict-checking procedures when a lawyer is affiliated with more than one firm (New York State Ethics Op. 793 and 876); • Confidentiality issues in conflicts checks among firms with affiliated lawyers (ABA Model Rule 1.6(b)(7); • The issue of which cases a lawyer brings to which firms and the potential for disputes when a lawyer takes a lucrative case to one firm rather than another; and • The issue of fee-splitting and whether the rules for fee division between different firms apply when a lawyer is affiliated with multiple firms (Ohio Supreme Court Ethics Op. 2008-1; California Formal Ethics Op. 1986-88).