What is Howard Wolowitz's profession?

Howard Wolowitz’s profession is aerospace engineer.

Unlike Sheldon, Leonard, and Raj, Howard is an engineer rather than a physicist. He works in Caltech’s Department of Applied Physics, designing equipment connected with NASA missions and space exploration. His work gives him practical, hands-on expertise that contrasts with his friends’ more theoretical research.

Howard holds a master’s degree in engineering from MIT, but he does not have a PhD. This becomes a recurring joke on the show, especially when Sheldon dismisses him as less academically qualified. Howard counters that his engineering designs have real-world applications, including equipment sent into space.

His career eventually takes him beyond the laboratory: Howard becomes an astronaut and travels to the International Space Station during the fifth season. The series also jokes about one of his less glamorous projects, a malfunctioning zero-gravity toilet system. The common mix-up is calling Howard a physicist because he spends so much time with physicists, but his canonical occupation is aerospace engineer.