1. Candidato a Doctor, Department of Civil, Construction, and Environmental Engineering, The University of Alabama, Tuscaloosa, AL 35487-0205; and Profesor Asistente, Departamento de Ingeniería Civil, Universidad Industrial de Santader –Colombia, Carrera 27, Calle 9 Bucaramanga, Colombia.
2. Profesor Asistente, Del E. Webb School of Construction, School of Sustainable Engineering and The Built Environment, Arizona State University, Tempe, AZ 85287-0204,
3. Candidato a Master, Departamento de Construcción, Georgia Institute of Technology, 247 4th St. NW, Suite 351, Atlanta, GA 30332-0155,
4. Profesor Asistente, Departmento of Matemáticas, Universidad Industrial de Santander –Colombia, Carrera 27, Calle 9 Bucaramanga -Colombia,