Williams worked at NME initially on a freelance basis and then as features editor of the magazine in September 2010. He was promoted to deputy editor in June 2011, working across NME's multiple platforms.
During his time as deputy editor, Williams has worked on various special projects, including planning and co-ordinating the editorial coverage of the magazine's 60th birthday celebrations.
Prior to joining IPC Ignite's NME, Williams was editor of Kruger magazine, which he launched in 2004 and edited for six years - for which he was named Editor of the Year at the Record of the Day Awards in 2009.
Under his leadership, Kruger magazine went from a small fanzine in Cardiff to a national magazine with multi-platform offshoots including a website, live sessions site, subscriber-based download label and gig promotions arm.
Williams said: "I'm super excited to be the new editor of NME. As far as dream positions go, it really doesn't get any better than this.
"Krissi Murison has done an amazing job as my predecessor, and I'm totally honoured to pick up the baton from her. My challenge is to make NME magazine and the wider NME brand even sharper, our message more coherent and to engage even more with NME's audience of passionate music fans. With the brilliant team we've got in place, I can't wait to get started!"
Publishing director Emily Hutchings added: "After an extensive recruitment process, I am absolutely thrilled to announce Mike Williams as the next editor of NME. He brings with him a wealth of editorial experience as well as knowledge in managing multiplatform brand extensions. Mike demonstrated a clear strategic vision and passion for NME that will help take the brand on to even greater success."