Jack is the drummer for Friendly Fires. The guys met at St Albans School. At age 13, in Year 8/9 (the second or third year), the members formed their first band, a post-hardcore outfit called First Day Back, covering songs by Green Day and other rock-like artists, which existed until they began university.

In late 2007, they became the first unsigned band to appear on Channel 4’s Transmission programme. Their single "Paris" achieved "Single of The Week" in The Guardian newspaper, NME magazine, and also on Zane Lowe´s BBC Radio 1 show. They have toured extensively, with past performances and festival appearances throughout the UK, Europe, Japan, the U.S., Canada, Mexico, South America and Australia.