2004 - Present
Associate Professor, Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas
1998 - 2004
Assistant Professor, Department of Ecosystem Science and Management, Texas A&M University, College Station, Texas
1996 - 1997
European Sales Manager/Assistant Product Line Manager, OI Corporation, College Station, Texas
1995 - 1996
Assistant Project Manager, Pioneer Environmental Services, Inc., Logan, Utah
1994 - Present
President, Vector Flow, L.C., College Station, Texas
1992 - 1994
Post-doctor Research Associate, Department of Ecosystem Science and Management, Texas A&M, University, College Station, Texas
1990 - 1991
Associate Research Fellow, World Wide Fund for Nature MAPS Project, Harare, Zimbabwe
1987 - 1989
Research and Teaching Assistant, Range Science Department, Utah State University, Logan, Utah
1984 - 1985
Lecturer, Grassland Science Department, University of Natal, Pietermaritzburg, South Africa
1983 - 1984
Research Officer, Department of Agriculture, Pietermaritzburg, South Africa
2002 – Present International Association for Society and Natural Resources
1989 – 2004 International Society of Ecological Economics
1988 – Present Society for Range Management
1981 – 1995 Grassland Society of Southern Africa