Abstract: The author describes his experience of five years as a nurse practitioner in mental health at Waikato District Health Board. A recent review of the role gave him the opportunity to reflect on the learning associated with assuming the nurse practitioner role. A key area of learning has been in negotiating the shifting responsibilities and changing relationships associated with his role as an nurse practitioner and also as a Responsible Clinician, a role traditionally held by psychiatrists. The Responsible Clinician role is a statutory one under the Mental Health Act (1992), generally performed by psychiatrists but open to other suitably qualified professionals. He reports the results of a review based on feedback from fellow professionals, clients and their families, along with quantitative data from basic statistics connected to the role, such as a time and motion study. The review asked fellow professionals to rate the performance of the nurse practitioner against the Nursing Council competencies. These results indicate the nurse practitioner role is of some value and that other professionals and clients seem satisfied with the role. There is some evidence it is delivering outcomes acceptable to clients and other professionals. The study has many limitations which are discussed, such as a poor response rate and short time frame. Further research is planned to evaluate this role.