Purpose: Established professions and knowledge workers identify more with their professional groups than with their organisations. The purpose of the study was to find what kind of work-related identities are shown by clinical research sector employees in Poland, what is the intensity of those identities and which one is dominant.

Methodology: The study started with qualitative interviews dedicated to professional changes and to work-related identity. The latter was selected for the main quantitative part of the study and its five types were defined related to the trained profession, the practised profession, organizational, relational and task-related work identities. Intensity of these pre-defined identities was tested with a use of a questionnaire completed by 147 representatives of the sector under study. Statistical analysis of the collected data verified the research hypotheses that assumed a certain gradation of these work-related identities.

Results: Professional identity related to the practised occupation was placed on the highest level followed by task-related identity. Relational and organisational identities were classified on the third and fourth levels. Identity related to the trained occupation achieved the lowest score. The employing organization type had no effect on the manifested professional identity.

Originality value: As a developing new occupation, the study group itself was an interesting population for studying work-related identity. Combining the qualitative and quantitative methods enabled evaluation of the results against the professional changes shaping the sector, which can have an impact on building the work-related identity of its employees.