<bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Background:</i></b> Responding to current research gaps in the investigation of researcher identity development among graduate students, we implement a longitudinal study, powered by user-experience (UX) methods, to document engineering doctoral students’ identity formation. <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Literature review:</i></b> Identity formation in novice engineering researchers, such as doctoral students remains underexamined. A process-oriented approach to studying researchers’ identity development may yield useful theoretical and programmatic insights. UX methods offer visual and qualitative approaches to the understanding of student experiences by revealing their identity formation journey over time. <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Research questions:</i></b> 1. How can UX methods like persona building support studies of researcher identity development? 2. How can the insights generated from longitudinal UX methods inform graduate program design and assessment? <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Methodology:</i></b> Twenty participants were recruited from an industrial engineering department at an R1 university. Data were collected via surveys, qualitative interviews, and journey mapping. Analysis methods, informed by a phenomenological perspective, included persona building and collaborative affinity diagramming. <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Results:</i></b> Seven distinctive personas were created to represent identity formation experiences influenced by learning modality, attitude, program stage, and prior experience. Theoretical conclusions and opportunities for academic programming emerged from affinity diagrams. <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><i>Conclusion:</i></b> Doctoral engineering students’ researcher identity formation presented implications for theory and curricular design. UX methods offered benefits to qualitative research that can support cross-disciplinary efforts.