2011-2019

Edil Torres Rivera

United States of America

2003-2010

Silvia Helena Koller 

Brasil

1998-2003

Irma Serrano-Garcia

Puerto Rico

1990-1998

José Miguel Salazar

Venezuela

1983-1989

Luis Laosa 

United States of America

1977-1982

Gordon Finley

United States of America

1975-1976

Horacio Rimoldi

Argentina

1970-1975

Luis Natalicio

United States of America

1967-1970

Carl F. Hereford

United States of America