Joel Schwartz , PhD
Environmental epidemiologist — Harvard School of Public Health (formerly EPA)
- Site
- Oversight
- Affiliation
- Harvard School of Public Health (formerly EPA)
- TLC era
- 1990s
- Tags
- Dose-ResponseMeta-AnalysisACCLPPEPA
Epidemiologist, initially at EPA, then Harvard School of Public Health. Established the foundational dose-response relationship between blood lead levels and IQ in children. His 1994 meta-analysis grounded the ~3 IQ point per 10 µg/dL estimate that anchored the regulatory case against low-level lead exposure.
Schwartz's dose-response framework is foundational to interpreting TLC's results. The trial found a 4.5 µg/dL difference in blood lead levels between groups during treatment — predicting roughly 1–1.5 IQ points of cognitive benefit applying his estimate, a real effect TLC may have been underpowered to detect against the noise of its other limitations (iron deficiency, environmental re-exposure, vitamin contamination, and the 34-week gap between end of treatment and cognitive testing).
Federal contributor to the 1991 ACCLPP Strategic Plan (as EPA representative). Voting member of ACCLPP, 2002 — the same committee that would later receive Rogan's presentation of TLC results.
Not on the NIEHS TLC investigator roster. Included here because his dose-response work shaped the interpretation of TLC's blood-lead difference and because of his ACCLPP role during the period TLC was being incorporated into policy.