1. Dr. Arthur E. Weis, Ph.D. from the University of Illinois (1981-1984)
2. Dr. Kenneth D. McCrea, Ph.D. from Purdue University (1982-1988)
3. Dr. Ann F. Johnson, Ph.D. from the University of California, Davis (1983-1987)
4. Dr. James K. Nitao, Ph.D. from the University of Illinois (1987-1988)
5. Dr. Gwendolyn L. Waring, Ph.D. from Northern Arizona University (1988)
6. Dr. Michael R. Sackschewsky, Ph.D. from Washington State University (1988)
7. Dr. John D. Horner, Ph.D. from the University of New Mexico (1988-1990)
8. Dr. Timothy P. Craig, Ph.D. from Northern Arizona University (1989-1990)
9. Dr. Joanne K. Itami, Ph.D. from Northern Arizona University (1989-1990)
10. Dr. Anantanarayanan Raman, Ph.D. Fulbright Scholar from the University of Madras, Madras INDIA (1990-1991)
11. Dr. Jonathan M. Brown, Ph.D. from Michigan State University (1991-1994)
12. Dr. George Melika, C.Sc. (Ph.D. equivalent) from the Institute of Zoology of the Ukrainian Academy of Science (1994-1996)
13. Dr. György Csóka, C.Sc. (Ph.D. equivalent) from the Hungarian Academy of Sciences, Hungary (1995)
14. Dr. James T. Cronin, Ph.D. from Florida State University (1995-1997)
15. Dr. Micky D. Eubanks, Ph.D. from the University of Maryland (1997-1998)
16. Dr. Amy V. Whipple, Ph.D. from the University of California, Davis (1998-2002)
17. Dr. Shellee A. Morehead, Ph.D. from the University of Utah (1999-2001)
18. Dr. Jason T. Irwin, Ph.D. from Miami University, Ohio (2002-2004)
19. Dr. Michael J. Wise, Ph.D. from Duke University (2003-2008)
20. Dr. Netta Dorchin, Ph.D. from the University of Tel Aviv (2005-2007)
21. Dr. Mizuki Takahashi, Ph.D. from the University of Memphis (2008-2011)