Anna Lembke is an American psychiatrist specializing in addiction medicine. She serves as chief of the Stanford Addiction Medicine Dual Diagnosis Clinic at Stanford University, where she focuses on treating patients with co-occurring addiction and mental health disorders. Lembke has established herself as a leading expert on the opioid epidemic in the United States. She authored Drug Dealer, MD: How Doctors Were Duped, Patients Got Hooked, and Why It's So Hard to Stop, which examines the role of medical professionals in the opioid crisis. Her 2021 book Dopamine Nation: Finding Balance in the Age of Indulgence explores how modern society's abundance of stimulating experiences affects the brain's dopamine system and contributes to various forms of addiction and compulsive behavior. The book became a New York Times bestseller and reached a wide popular audience.