Donald T. Campbell
1916–1996 — social scientist; Campbell's Law and the experimenting society
Methodologist who argued that quantitative social indicators used for high-stakes control become corrupted and distort the processes they monitor.
Donald T. Campbell (1916–1996) was an American social scientist — psychologist and methodologist — associated with quasi-experimental design, evolutionary epistemology, and the experimenting society. He is the namesake of Campbell’s Law, formulated in the 1970s and widely cited from his 1979 essay Assessing the Impact of Planned Social Change.
Why he matters here
Campbell argued independently of Charles Goodhart that quantitative indicators wired to social decision-making face corruption pressure and distort the processes they were meant to monitor — the organisational mechanism behind Goodhart’s Law and metric substitution in human systems. Jeff Rodamar (Significance, 2018) argues Campbell articulated the broader social-science form before Goodhart’s monetary-policy statement became famous; the corpus keeps both attributions explicit.