Born in Dublin, Ireland, Declan started hairdressing in 2000.
In 2003 he moved to London to worked as an educator for L’Oreal, Wella and Toni&Guy Acadamy. Declan gained recognition for his work as a finalist and winner of various L'Oreal and Wella competitions and numerous hairdressing awards.

Moving more into session work in 2010, Declan was regularly requested for various show work at New York, London, Paris and Milan Fashion Weeks and worked as first assistant to Sam McKnight for 3 years.

Declan's photographic work has appeared internationally in publications including 10 Magazine, Buffalo Zine, CR Fashion Book, Dazed, Elle, GQ, Harper’s Bazaar, i-D, LOVE, Mixte, Odda, Pop, Tank, Tatler, Vogue.