[1] Siegel completed his residency in preventive medicine at the University of California, Berkeley School of Public Health and trained in epidemiology at the Centers for Disease Control for two years.
[2] Siegel is known for his work in the area of tobacco control and the harmful effects of passive smoking.
[1] However, in 2007, he published a paper dismissing claims that brief exposure to secondhand smoke increased the risk of heart attacks or presented any other significant cardiovascular risk to nonsmokers.
[3] He has been called out for going astray by his former mentor Stanton Glantz who called him "a tragic figure - he has completely lost it," and "his view is that everybody in the tobacco control movement is corrupt and misguided except for him".
[9] He has also published research about how the soda industry spends millions on health organizations, yet simultaneously lobbies against public health laws intended to reduce consumption of their products.