Gill's session work was heavily influenced by music and youth culture. His teenage years were spent immersed in the punk movement in Brighton and, after moving to London at the age of 16, he became involved in the club scenes from new romantic, goth, rave, to hip hop and ska.

i-D magazine described his work as having "cross-gender styling and a clean artful aesthetic, whilst maintaining a certain punk masculinity." In 2016, Paris Vogue featured Gill, citing him as one of the most exciting new generations of hairstylists in fashion. In the same year, Man About Town also wrote an exclusive feature on Gill titled "Hairdresser on Fire." In 2019, Double magazine featured him in their top 12 influential people in fashion that year, describing his work as anti-glamour, a label that he is very proud of. In 2018 Gill was appointed contributing editor for Dazed & Confused magazine, and in 2019 was voted into the BOF 500, the global index of professionals shaping the fashion industry.

His surreal hair story Metamorphosis, created in collaboration with photographer Casper Sejersen for Beauty Papers, was awarded Best in Book award in Creative Review's Photography Annual 2018. Images from this story were exhibited with a hair installation at Foam Photography Museum, Amsterdam in December 2019. In the same year, volume two of Metamorphosis was released by Beauty Papers as its first-ever limited-edition magazine, exclusively featuring Gill and Sejersen's surreal beauty project, with launches in Paris and New York. Gill is currently the contributing editor at Beauty Papers.

In 2025 Gill created fashion history by making a coat from synthetic hair which walked the runway in Balenciaga’s 54th couture shows at Paris Fashion week. In December 2026 he stepped back from fashion to focus on new creative projects that are currently in development.