He is the Professor of Risk Information Management in the School of Electronic Engineering and Computer Science at Queen Mary University of London.

[1][2] At the end of that period he changed fields[2] and began publishing papers on structured programming with Robin W. Whitty and Agnes A.

[6][7][8] In 1989 Fenton moved to City University as a reader in software reliability, and became a professor of Computing Science in 1992.

[1] In 1998, Fenton, along with Martin Neil and Ed Tranham, set up the company Agena Ltd in Cambridge.

In 2000, Fenton joined Queen Mary University of London (School of Electronic Engineering and Computer Science) where he works part–time as a professor.