Specializes in:


Jim is an environmental toxicologist and Massachusetts Licensed Site Professional (LSP) with knowledge developing risk-based conceptual site models for complex settings. He is particularly effective at cutting through accumulations of BS (Bad Science) to arrive at a more accurate understanding of true environmental conditions. Before entering the consulting field, Jim was manager of EPA Region1’s PCB program under the office of pesticides and toxic substances in the early 1980s.


Jim Okun has an extensive background with polychlorinated biphenyls (PCBs), their environmental chemistry and human health effects.

3-2012 Comments on USEPA’s Proposed Reinterpretation of the PCB Bulk Product Waste Definition smallpdf (14 kb)

Jim Okun’s 2010 UMass Soils Conference Presentation smallpdf (3.36 MB)

Jim Okun’s 2011 UMass Soils Conference Presentation smallpdf (3.18 MB)


M.S. in Toxicology,  Massachusetts Institute of Technology, 1978
B.S. Chemistry,  Massachusetts Institute of Technology, 1975

O’Reilly, Talbot & Okun Staff