Diane G. Cook (born 1943) is a Parkinson’s disease patient advocate, especially well known for the use of the science of self-efficacy to help newly diagnosed patients with Parkinson’s. She accomplishes this through her roles as a senior patient advocate for the ProjectSpark Foundation (an advocacy organization for Parkinson’s disease education, research and patient support). Cook also is a present and past clinical investigator on a number of clinical trials, and a speaker, writer and presenter at numerous local, state, national, and international forums focused on Parkinson’s. She was diagnosed with Parkinson’s disease in 2008.