Research Interests:
His current work includes four NASA funded projects that aim to examine the impact of long duration spaceflight and extreme isolation on astronaut immune function and illness rates, and the effects of simulated microgravity on viral infectivity and host immune evasion. Dr. Simpson is also investigating how certain viral infections can protect patients from relapse following hematopoietic stem cell transplantation in a project that has been funded by the National Cancer Institute.