Present professional activities.

Full Professor of the Department of Philosophy, Federal University of Santa Catarina - UFSC, retired.

Full Professor of the Department of Mathematics, Federal University of Paraná - UFPR, retired. 

Professor at the Graduate Program in Logic and Metaphysics of the Federal University of Rio de Janeiro.

Researcher of the Conselho Nacional de Pesquisa Científica (CNPq) since 1992, level 1A. 

Coordinator of the research group Lógica e Fundamentos da Ciência of the Diretório de Grupos de Pesquisa do CNPq.

Reviewer for many journals and editorial houses.