Diomidis Spinellis is a professor of Software Engineering in the Department of Management Science and Technology at the Athens University of Economics and Business, Greece and a professor of Software Analytics in the Department of Software Technology at the Delft University of Technology.

In 2013 he worked as a site reliability engineering senior software engineer for Google, while from 2009 to 2011 he managed the IT Systems at the Greek Ministry of Finance. He has published more than 300 technical papers in journals and refereed conference proceedings, which have received more than 8000 citations. He served for a decade as a member of the IEEE Software editorial board, authoring the regular "Tools of the Trade" column. He has contributed code that ships with macOS and BSD Unix and is the developer of CScout, UMLGraph, git-issue and other open-source software packages, libraries, and tools. He holds an MEng in Software Engineering and a PhD in Computer Science, both from Imperial College London.

Diomidis is a senior member of the ACM and the IEEE and Editor-in-Chief emeritus of IEEE Software.