Oleh Hornykiewicz, a giant in the understanding and treatment of Parkinson disease.

Oleh Hornykiewicz (November 17, 1926-May 26, 2020), by demonstrating the loss of dopamine neurons in Parkinson's disease, introducing the effort to treat the disorder with L-DOPA, and other innovative research, improved the lives of countless individuals and transformed neurology and medical science. Here we celebrate the life and great achievements of an outstanding scientist.