If you, or someone you know, has Parkinson’s disease, mental health issues, or other neurological disorders, medication can often help. The bulk of these medications have been established based on the work of neuroscientist Paul Greengard from the Rockefeller University, who worked out just how the brain responds to neurotransmitters — the chemicals that help the brain signal. Most of what most neuroscientists know today about neurotransmission, and specifically the dynamics of slow synaptic transmission, is predicated on the work of Dr. Greengard. The interview features stories about his seminal research discoveries and his competitive streak in potato sack races.