Jamil Kazmi is a multilingual American singer-songwriter and lyric consultant known for his work in Japan's entertainment and music industry. He developed a passion for music at age 14 and began producing independently, eventually traveling the world and immersing himself in new cultures. His deep admiration for the Japanese language and culture led him to pursue university studies in Japan and launch a career there as both an artist and cultural bridge.

He writes and performs songs in Japanese, emphasizing authenticity and emotional connection. Beyond his musical endeavors, Jamil has also gained popularity on Japanese television, appearing as a regular guest on shows such as Nep & Imoto no Sekai Banatsu and hosting radio programs like JAMIL Be the World. His discography includes solo albums, television theme songs, and lyric contributions for artists such as SCANDAL, Naoto Inti Raymi, and SixTONES.

Jamil Kazmi contributed to ONE OK ROCK's global efforts as a lyric translator and English language consultant, most notably credited on their 2013 album JINSEI×BOKU=. His role involved refining and translating Japanese lyrics into fluent and emotionally expressive English, helping the band preserve the depth of their message for international audiences.

As ONE OK ROCK began incorporating more English into their music and expanding their reach globally, Jamil's linguistic skill and cultural sensitivity were essential. His translation work helped maintain lyrical integrity across languages, supporting the band's transition into a bilingual act without compromising authenticity or impact.