Research into the effects of legal representation is rare because in many settings in which people might have lawyers, legal representation is either so common or so unusual that it cannot serve as a variable. Moreover, such research as exists is often poorly controlled or otherwise methodologically deficient. Our data set, derived from the case files of a public housing eviction board, allows us to overcome most of the difficulties that plague prior studies because it is relatively large and unusually rich in information about individual cases. We model the effects of various tenant and case characteristics on lawyer involvement as well as the effects of legal representation on case outcome. We find that lawyers tend to handle more difficult cases and that the likelihood that legal representation will aid a tenant depends on case type and changes over time. Our results, though likely to be context dependent, suggest how the effects of legal representation may be studied in other settings and the kinds of variables that may condition such effects.