| 1975-1977 | Peace Corps Volunteer, Republic of Benin, West Africa |
| 1978-1980 | Meat Grader/Inspector, United States Department of Agriculture, Sioux City, Iowa |
| 1980-1987 | Supervisor, Label Review and Approval Section, Standards and Labelling Division, United States Department of Agriculture, Washington, DC |
| 1987-2003 | Secretariat of the Joint FAO/WHO Codex Alimentarius Commission, Food and Agriculture Organization of the United Nations, Rome, Italy |
| since 2003 | Manager of the Food and Environmental Protection Subprogramme, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna |
| 1979 | Bachelor of Arts - Biology, Whitman College, Walla Walla, WA, USA |
| 1980 | ,1983 Wildlife Biologist, Group Leader, Southeastern Cooperative Wildlife Disease Study, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA; Haiti, West Indies |
| 1982 | Master of Science - Medical Microbiology Graduate School, College of Veterinary Medicine, The University of Georgia |
| 1985 | Doctor of Veterinary Medicine College of Veterinary Medicine - The University of Georgia, Athens, GA, USA |
| Wildlife Veterinarian, Southeastern Cooperative Wildlife Disease Study, College of Veterinary Medicine, University of Georgia, Athens, Georgia USA |
| 1985-1990 | Veterinary Medical Officer, United States Department of Agriculture, Animal and Plant Health Inspection Service, International Services; Co-Assistant Director for Technical Services, Mexico-United States Commission for the Prevention of Foot-and-Mouth Disease and Other Exotic Diseases of Animals, Mexico City and Greenport, NY, USA |
| 1990 | Board Certification - American College of Veterinary Preventive Medicine |
| 1990-1992 | Fellow - Yale University, Yale University, New Haven, CT, USA |
| 1992 | Master of Philosophy, Epidemiology of Infectious Diseases Yale Arbovirus Research Unit, Department of Epidemiology and Public Health, School of Medicine, Yale University |
| 1992-1995 | Veterinary Medical Officer, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA |
| 1995 | Philosophiae Doctor, Epidemiology and Public Health Yale Arbovirus Research Unit, Division of Epidemiology and Infectious Diseases, School of Medicine, Yale University, New Haven, CT, USA |
| 1995-1997 | Epidemiologist - Veterinary Medical Officer, Centro Panamericano de la Fiebre Aftosa, Organización Panamericana de la Salud / World Health Organization, Duque de Caxias, Rio de Janeiro, Brazil |
| 1997-1999 | Head, Diagnostic Services, United States Department of Agriculture, Animal and Plant Health Inspection Service, Plum Island Animal Disease Center, Greenport, NY, USA |
| 1999-2002 | Head, Reagents and Vaccines, United States Department of Agriculture, Animal and Plant Health Inspection Service, Plum Island Animal Disease Center, Greenport, NY, USA |
| 2002-2009 | Head, Infectious Diseases Group, Animal Health Service, Animal Production and Health Division, Food and Agriculture Organization of the United Nations, Rome, Italy |
| since 2009 | Chief Veterinary Officer, Animal Production and Health Division, Food and Agriculture Organization of the United Nations, Rome, Italy |
