1. Associate Professor.
2. Research Assistant.
3. Postdoctorate Fellow.
4. Research Technician, Department of Anesthesiology and Center for Free Radical Biology.
5. Professor, Departments of Anesthesiology, and Biochemistry and Molecular Genetics, and Center for Free Radical Biology, The University of Alabama at Birmingham.
6. Professor, Department of Anesthesiology and Center for Free Radical Biology, The University of Alabama at Birmingham, and Laboratorio de Enzimología, Facultad de Ciencias, and Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, University of the Republic, Montevideo, Uruguay.