Integrating two disparate functions in organizations—marketing and information services (IS)—has become a critical business concern due to the increasing use of information technology (IT) to find and open new markets, deliver improved services to customers, and streamline internal marketing processes. This study appears to be the first to empirically examine the dynamics of bringing these distinct groups of specialists together. We investigate potential antecedents, consequences, and contingencies of IS-marketing integration, drawing on theories of complementarity and competence. Through a survey of IS and marketing executives, we learn that integration is facilitated by trust between the two functions and the interaction between IT strategic intent and customer orientation; it is impeded by a gap in top management knowledge of IT versus marketing. We also find that integration fosters the much-coveted capabilities of developing and introducing innovations (innovativeness) as well as responding flexibly, swiftly, and adroitly to opportunities (strategic responsiveness). Additionally, we determine integration is bounded by market dynamism. In sum, integration between marketing and IS can be enhanced via managerial efforts, and the relationship is profoundly beneficial to businesses.