Year | Position | Institution |
1989 | Illinois Natural History Survey 4 | |
1991 | Illinois Natural History Survey 4 | |
1992 | Smithsonian Museum Support Center 4 | |
1993 | Smithsonian Institution 4 | |
1994 | Smithsonian Institution 4 | |
1995 | Smithsonian Institution 4 | |
1996 | Smithsonian Institution 4 | |
1997 | Smithsonian Institution 4 | |
1998 | Smithsonian Institution 4 | |
1999 | Smithsonian Institution 4 | |
2000 | Smithsonian Institution 4 | |
2001 | Smithsonian Institution 4 | |
2002 | Florida State University 4 | |
2003 | Florida State University 4 | |
2004 | Florida State University 4 | |
2005 | Florida State University 4 | |
2006 | Florida State University 4 | |
2007 | Florida State University 4 | |
2008 | Florida State University 4 | |
2009 | Duke University 4 | |
2010 | Duke University 4 | |
2011 | Duke University 4 | |
2012 | Duke University 4 | |
2013 | Duke University 4 | |
2014 | Duke University | |
2015 | Duke University | |
2016 | Duke University |