Jackson retired from teaching in May 1995, but retained his connection with LBNL. In the 1990s and beyond his time was increasingly devoted to semi-historical talks and publications on a variety of topics, with a foray into refuting suggestions that cancer may be caused by environmental radiation stemming from ubiquitous electronics use. This includes a continuing series of papers in the American Journal of Physics on diverse topics in electromagnetism, including rebuttals of mistaken ideas. History of physics publications include the historical roots of gauge invariance, examples of the misattribution of discoveries in physics, and the editing of a sequel to R. T. Birge's history of the Berkeley Physics Department.