[2] His doctoral thesis, titled "The Economic Policies of the Labour Government of 1929-1931" was supervised by Professor Lord Kahn.

[4] Janeway joined Warburg Pincus, the private equity firm, in 1988 as head of its high technology investment team.

[4] The firm’s high-tech investments through the 1990s centered on information and communications technology, and, after 1991, increasingly focused on enterprise software.

[4] In collaboration with Michael McKenzie of the University of Sydney, Janeway conducted research on venture capital returns.

He is the author of Doing Capitalism in the Innovation Economy: Reconfiguring the Three-Player Game between Markets, Speculators, and the State, published by Cambridge University Press in 2012.

In 1985, Janeway married Weslie Resnick, a vice president of F. Eberstadt & Company, in a non-denominational ceremony in New York City.

[14][15] In September 2012, Janeway was awarded an honorary Commander of the Order of the British Empire (CBE) "for services to education in support of Cambridge University and to UK/US relations".