Appointed a research associate in 1966, and then a senior research associate (1969–1980), da Rosa became a professor in electrical engineering in 1980. During this time, his interests gradually turned more to the fundamentals of energy processes and renewable energy. His classes on renewable energy were greatly appreciated by the students and he continued teaching these energy classes until 2011, well after his retirement in 1983.
Appointed a research associate in 1966, and then a senior research associate (1969–1980), da Rosa became a professor in electrical engineering in 1980. During this time, his interests gradually turned more to the fundamentals of energy processes and renewable energy. His classes on renewable energy were greatly appreciated by the students and he continued teaching these energy classes until 2011, well after his retirement in 1983.