Individuals make use of many aspects of the speech signals to construct personas and to project hidden desires to the external world. Of interest here is whether vocal characteristics and the perceptual evaluation of them exert an influence on listener behavior. With the exception of a few pioneering studies (e.g., Purnell et al. 1999), this question has remained largely unexplored. In the present study, we examine the vocal characteristics of lawyers arguing in front of the Supreme Court of the United States and link this data to the lawyers’ actual win rates in the Court. We show that perceived attributes of voices predict Supreme Court wins, suggesting potential differential labor market treatment of lawyers with certain mutable characteristics such as sounding more or less masculine or confident.