He was elected to the Chamber of Deputies of Chile for Popular Unity in 1973, but left office after the coup d'état.
He attended the Manuel de Salas Experimental School affiliated with the University of Chile.
Rojas Wainer became the first person elected to three terms as leader the University of Chile Student Federation, serving between from 1970 to 1973.
Rojas Wainer was elected to the Chamber of Deputies for the Popular Unity political coalition in 1973, while still president of the student federation.
[2] Rojas Wainer died of cancer at the age of 73 on 16 April 2018 in Vancouver.