Undergraduate education represents an important transitional stage in which students make career decisions, and undergraduate research experiences (UREs) play a critical role in training the next generation of science, technology, engineering, and mathematics researchers. Extensive studies have identified the different ways in which researchers and graduate students understand their profession, but little work has focused on undergraduate students. To contribute to this gap in literature, this study examines how undergraduate students conceptualize successful researchers. Data were collected using semistructured interviews with transfer students at a research-intensive university, in which participants articulated how they perceive a successful researcher and how their conception had changed based on their undergraduate experiences. Using phenomenography as the research approach, three conceptions of successful researchers were identified based on variations within the following aspects: process of research, interactions with other researchers, and scope of contribution. Retrospective conceptions were more simplistic, with little appreciation for the complex methodological processes and collaborations needed to meaningfully contribute to the research community. After UREs, participants reported conceptions with more nuanced understanding that successful researchers demonstrate proactive engagement, collaboration, and contribution. These findings can be applied to facilitate meaningful research experiences and target undergraduates' professional development as they are enculturated into the research community.