The Big Bang Theory | Theory of a Deadman | music theory | probability theory | theory | Theory of relativity | theory of relativity | Social learning theory | Game Theory (band) | Game Theory | Epidermal growth factor receptor | Conspiracy theory | Music theory | K-theory | AP Music Theory | Piaget's theory of cognitive development | conspiracy theory | Theory of Relativity | Theory | The Limits to Growth | Terror management theory | Invariant theory | information theory | growth | graph theory | Galois theory | Einstein–Cartan theory | Economic growth | Conspiracy Theory with Jesse Ventura | Chaos theory |
As part of his research career, he originated the insider-outsider theory of employment and unemployment with Assar Lindbeck, the theory of high-low search with Steve Alpern, and the chain reaction theory of unemployment and the theory of frictional growth with Marika Karanassou and Hector Sala.