Notable as the drummer of the UK rock band Amaryllis, Mann rose to fame following the 2013 release of his first Amaryllis EP. A year later, his band released its second EP, Revolt.
Soon after forming Amaryllis, he and his bandmates documented their travels in a YouTube video titled "Amaryllis UK Tour Highlights."
By the beginning of 2015, his band had nearly thirty thousand Twitter followers.
He and Joseph Mount are both well known English drummers.