The primary purpose of the current study is to identify how human resource development (HRD) research has contributed to the knowledge base across social science disciplines during the past two decades. We identified the top 20 Academy of Human Resource Development (AHRD) journal articles that have been most frequently cited in research articles published in journals other than the four AHRD journals. With the use of content analysis of the most-cited articles, three key research themes were identified: (a) training transfer and evaluation, (b) learning in organizations, and (c) knowledge sharing and knowledge creation. The research contributions of HRD within the field of HRD and across disciplines are discussed.Research-pursuit of new knowledge and its dissemination-is the soul of academia.-Richard A. Swanson This article attempts to identify the inherent contributions of human resource development (HRD) as an academic discipline to the broader community of academia. In practice, it has been agreed that human resources in an organization are the primary source of core competitive advantage (Garavan, 2007). Increasingly, there is a need for the continuous improvement and development of human resources to help organizations adapt to changing environments, so companies have emphasized the importance of HRD. However, HRD still holds a peripheral position in the academic realm. For instance, despite the continuous efforts of the Academy of Human Resource Development (AHRD), the leading scholarly body of the discipline, no AHRD-sponsored journal has been listed in the Social Science Citation Index (SSCI) (Russ-Eft, 2008 Jeung, Yoon, Park, Jo degree titles and affiliations of undergraduate and graduate programs addressing HRD tend to be inconsistent across colleges and universities. These issues imply that there is a lack of recognition from the larger academic community, as well as an incomplete establishment of the distinct identity of HRD.HRD is known as a multidisciplinary field (e.g., McLean, 1998;Swanson, 1999;Weinberger, 1998), which owes its foundation to external academic fields (Jacobs, 1990;McGuire & Cseh, 2006). However, although HRD has built a unique body of work that has made significant contributions to various social science fields over several decades, it has not received adequate recognition. Given that little attention has been paid to the HRD community' s scholarly contributions across disciplines, there is a need to understand the identity of HRD by identifying the "multidisciplinary" contributions of HRD research across various disciplines. Unfortunately, few attempts to explore the scholastic contributions of HRD have effectively transcended the boundaries of the AHRD community.Our approach to explore the contributions of HRD is to count citation frequency. A citation link between any two documents shows an association of a research topic and a connection between the scholastic ideas. In research communities, citation frequency is used as a method to assess professional recognition and relat...