Scott E. Hadland (born November 19, 1981) is a Canadian-American physician and scientist who serves as a pediatrician, and addiction specialist at Massachusetts General Hospital[1][2][3] and Harvard Medical School, where he is the Chief of the Division of Adolescent and Young Adult Medicine.

[6] A key finding of Hadland's research has been to confirm that an increase in dollars spent on marketing from the pharmaceutical industry to American doctors was linked to mortality from opioid overdoses one year later.

[7][8][9] A series of studies led by Hadland provide evidence linking the marketing of opioids directly to doctors, and the addiction epidemic in the United States.

[7][8] The pharmaceutical industry spent $39.7 million promoting opioid medications to nearly 68,000 doctors from 2013 through 2015, including meals, trips and consulting fees.

[7] For every three additional payments to doctors per 100,000 people in a county, overdose deaths involving prescription opioids in that area, a year later, were 18 percent higher.