A not-for-profit organization of medical and research centers throughout the United States and Canada that coordinates clinical research studies and whose research findings provide information regarding improved treatment options for people with Parkinson’s disease. The Parkinson Study Group funds and supports numerous research studies and partners with various experts such as pharmaceutical companies to introduce new treatments. The group’s website, www.parkinson-study-group.org, maintains a listing of active clinical research studies, including those that are recruiting participants. it also reports on the findings of completed studies. Because the Parkinson Study Group is a network of providers and facilities, its central address is that of its current chairperson. Access to the group and the information it provides is obtained through the website.