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As a Professor of Statistics, Epidemiology, Public Health and Psychiatry for the last 30 years he has taught, applied and consulted on all of these methods. First trained as public health physician, he did his graduate work (MS and PhD) in the Division of Statistics of the Department of Mathematics of The Ohio State University. His graduate work was completed independently of his medical education. His dissertation was in biostatistics. He has taught graduate seminars covering each of these topics and has used all of the methods as an expert in support of litigation. He is particularly interested in the design and execution of clinical trials and the evaluation of inferences made from these trials. He is also interested in the inferences that can be made from observational data and the relationship between observational studies and more formal designed trials. He often works on problems where the medical issues are complex, the pathophysiology is in debate, the data are limited and major policy or legal questions rely on the interpretation of statistical data.

He has worked on at least one legal case involving each of theses topics often as a consulting witness not a testifying witnesses. Most of these were federal class action or MDL litigation or state medical malpractice cases. Over 30 years topics have included the safety of the Dalkon Shield, Agent Orange, asbestos, talc, PPA, Cox-2 pain relievers, smoking, Dioxin, PCB's, ionizing radiation, etc.

His area of expertise is the methodology underlying inferences from epidemiological studies and thus has been involved with data analysis and models in all of the areas of epidemiology listed. He focuses on complex issues in policy or litigation where the limits to statistical inference from epidemiological are of primary concern. Has most experience in problems where there are limitations to the quality of the data or the design of the study and epidemiological studies have made inconsistent pronouncements about the issue at hand. Is comfortable working on problems in toxicology or other areas where the pathophysiology or basic biology are complex.

He has worked on at least one legal case involving every one of these issues often as a consulting witness not a testifying witnesses. Most of these were federal class action or MDL litigation. Over 30 years topics have included the safety of the Dalkon Shield, Agent Orange, asbestos, talc, PPA, Cox-2 pain relievers, smoking, Dioxin, PCB's, ionizing radiation, etc. and a variety of occupational and environmental exposures.

Worked on a variety of product liability, environmental exposure, occupational exposure, and malpractice cases over 30 years. The first was the DALKON Shield IUD. Others include Phen-Phen, Tainted blood products, ionizing radiation, PPA, Agent Orange, Smoking, Asbestos, Cox-2 pain relievers, etc. The malpractice cases have involved cardiology, surgery, pulmonology, psychiatry, pediatrics, etc. Several tines he was a consulting expert as opposed to a testifying witness.