As research has become part of chaplaincy, many chaplains become involved in research, often in the double-role of chaplain-researcher. Despite the increase of involvement in research, how conducting research benefits chaplains’ professional care for clients has not been studied. The present study aimed to describe how chaplains perceive the impact of participation in the Dutch Case Studies Project (CSP) on their professional expertise and positioning in the institution. A survey was distributed among participants of the CSP (N=50) and was completed by 48 participants. We found that participation in research contributed to the expertise of chaplains (e.g., its goal-orientation, the use of theory and method) and their positioning as they try to legitimate their profession. This study thus substantiates the presumption that chaplains’ engaging in research as chaplain-researcher contributes to the perceived improvement of the quality of chaplaincy care and its legitimation.