She spent 11 years in the Environmental Physiology Department of the U.S. Naval Medical Research Institute in Bethesda, Maryland where she performed research on the physiology of ultradeep diving, and was eventually the head of the decompression sickness research program. She is the patented inventor of biochemical decompression. Dr. Kayar has also managed biomedical research programs for the US National Institutes of Health (NIH), the Defense Advanced Research Projects Agency (DARPA), and the Office of Naval Research (ONR). She published her first novel, Operation SECOND STARFISH, an ultra-deep submarine rescue story, in 2017. She is currently retired and living with her husband in the US southwestern city of Santa Fe, New Mexico.