Alberto Espay, MD, FAAN, University of Cincinnati, Cincinnati, OH, discusses the downfalls of current attitudes towards subtyping in Parkinson’s disease (PD). PD is a complex disease with heterogeneous clinical subtypes. Thus, the development of reliable biomarkers is critical for improved clinical management. However, many investigational biomarkers have shown significant patient variability and low reproducibility over time. New ways of approaching the identification of biological markers in PD are needed. This interview took place during the American Academy of Neurology (AAN) 2021 Annual Meeting.