As part of the research program in 1975 and 1977 at the department of physics at The City College of The City University of New York, Kaku worked on research on quantum mechanics.He was a Visitor and Member (1973 and 1990) at the Institute for Advanced Study in Princeton and New York University. He currently holds the Henry Semat Chair and Professorship in theoretical physics at the City College of New York.
Kaku had a role in breaking the SSFL ( Santa Susana ) story in 1979. The Santa Susana facility run by RocketDyne was responsible for a experimental sodium reactor which had an accident in Simi Valley in the 50s. Kaku was a student involved in breaking the story of the leak of radiation.
Kaku has had more than 70 articles published in physics journals such as Physical Review, covering topics such as superstring theory, supergravity, supersymmetry, and hadronic physics. In 1974, Kaku and Prof. Keiji Kikkawa of Osaka University co-authored the first papers describing string theory in a field form.
Kaku is the author of several textbooks on string theory and quantum field theory.