Adjunct Professor (now retired in Scotland, UK) at University of Queensland, Australia.

Faculdade de Veterinária da Universidade Federal do Rio Grande do Sul (UFRGS)

University of lllinois at Urbana-Champaign

Professor Titular de Medicina das Aves (Avian Medicine) na Faculdade de Veterinária

Professor of Avian Medicine, University of Ibadan.

Chulalongkorn University

Department of Avian Diseases, Faculty of Veterinary Medicine, University of Tehran, Tehran …

Professor of Virology, University of Nairobi

Universidade Federal de Minas Gerais

Assoc. Prof. in Dep. of Poultry Diseases, Veterinary Medicine Faculty, Shahrekord Branch …