Dr de Souza is credited, together with allies such as Govind Panvelcar, with the first Congress Party victory in Goa in 1980.

[2] In July 1998 Dr de Souza formed the Goa Rajiv Congress Party as a splinter group of the INC.

In 1999, Dr de Souza joined the Nationalist Congress Party and was its Goa president from 1999 to June 2009.

For the 2012 assembly election he was a member of the All India Trinamool Congress as head of the Goa branch of the party.

[4] He was born in Kampala, Uganda on 23 April 1927, to Dr. Tito Fermino de Souza and Alina Ana Maria de Souza, Ugandan Indian parents of Goan Catholic origin and descent who both immigrated from Anjuna, Goa.