Initially a member of the Radical Civic Union, he later became a supporter of General Juan Perón, and served in several important positions during the successive peronist governments.

A lawyer by profession, Benítez first served as Minister of Justice during the de facto administration of President Edelmiro Farrell, who rose to power after the 1943 coup d'état.

His mother was Juana Ferrán, and his father was Cipriano A. Benítez, a Radical Civic Union politician who briefly served as mayor of Rosario from January to May 1910.

[2][3] Benítez was first appointed to the national cabinet as Minister of Justice and Public Instruction by President Edelmiro Farrell, who had risen to power following the 1943 coup d'état.

[4] In the 1946 general election, Benítez was the first candidate in the "Junta Renovadora UCR" list to the Argentine Chamber of Deputies in Buenos Aires.

The Junta Renovadora had been formed that year as a breakaway from the UCR backing the presidential candidacy of Lieutenant General Juan Perón, who was running under the Labour Party.

[8] In addition, Benítez sponsored the law to create the Faculty of Philosophy, Letters, and Education Sciences of the National University of Rosario.

[9] Following the return of democracy to Argentina and the election of Peronist Héctor Cámpora to the presidency in 1973, Benítez was once again appointed as Minister of Justice in the national cabinet.

His funeral was held at the Salón de los Pasos Perdidos of the Congressional Palace, and he was interred on 15 June 1992 at Chacarita Cemetery.