This article explores key aspects of my professional doctorate (DProf) that focused on the construction of my professional identity as an occupational safety and health professional, using autoethnographic inquiry. It promotes the use of the portfolio as part of the assessment for professional doctorates, and other further and higher education qualifications. The article investigates how, using autoethnography, this can be used as part of the research process. It concludes with my reflections on how undertaking a DProf has been beneficial regarding the redefining of, and the construction of, my own professional identity.