He became a regular instructor at the Naval Academy during 1844, conducting artillery classes.[13] In 1845, he was transferred from the Naval Academy to the faculty of the Military Academy teaching artillery, fortification, and later, mechanics.[13] In addition to teaching, Paranhos also became a journalist, and by 1844 was working for newspapers which supported the Liberal Party.[16][18] He remained a professor in the Military Academy and began teaching political economy, statistics and administrative law in 1863.[4][19] In 1874, Paranhos became the dean of the newly created Engineering School (today the Polytechnic School of the Federal University of Rio de Janeiro), a civilian branch of the Military Academy's engineering program.[20]