Visiting Scholars Tweet Visiting Scholars (Tentative) Tom Ewing, project director, is a professor at Virginia Tech. Jeffery Taubenberger, visiting scholar, is a research scientist at the National Institutes of Health. David Morens, visiting scholar, is a research scientist at the National Institutes of Health. Nancy Bristow, visiting scholar, is a professor at the University of Puget Sound. Vanessa Northington Gamble, visiting scholar, is a professor at George Washington University (more information).