Additional Study Information: The Parkinson's Progression Markers Initiative (PPMI) seeks to uncover insights into Parkinson's disease (PD) onset and progression that could transform how we diagnose, treat, and potentially prevent PD. PPMI has already contributed to a new understanding around disease biology and experience, and its findings and design have led to more efficient clinical research. Now PPMI is looking to bring together a larger and more diverse group of individuals both with and without PD who can help contribute to a more detailed look into the way the disease develops and changes over time. The study will cover the cost of study-related travel, and you will be paid a set amount at each visit to compensate you for time and completion of study-related procedures.