Declan Cosson was born in Paris, France in 1999. He moved to Ireland in 2001 where he has lived ever since.
He attended Hollypark school between 2005 and 2012. He then attended Clonkeen College between 2012 and 2018. He then studied English, Media and Cultural Studies in IADT in Dun Laoghaire between 2018 and 2022.
Declan started writing as early as fifteen years old and has been writing ever since. Currently he is 21 years old. During his time in Clonkeen, he contributed short stories to the Clonkeen Anthology. As a member of Fighting Words, in 2017 he contributed a short story to a special supplement to the Irish Times celebrating the 25th anniversary of the Convention on the Rights of the Child. He also contributed short stories to Inkslingers's Spooky Stories Collection" at the Irish Writer's centre in 2020.
"The Collection of the Yearly Strange" is his first publication on Amazon.