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This article presents a study on the effects on brain and immune function of a training program in mindfulness meditation applied in a work environment with healthy employees. The study measured brain electrical activity, before and immediately after the 8 week training period and four months after the training. The participants were also given a flu vaccine. The results report significant increases in brain activity associated with positive affect and significant increases in antibody titers among the meditation subjects, demonstrating the positive effects of mindfulness meditation on brain and immune function.