What is some background information on the poet who wrote "Dulce et Decorum Est"?

"Dulce et Decorum Est" is one of Wilfred Owen's most famous poems. Owen was an active soldier who was killed in the final week of World War I at the age of 25, but his poems have survived him. Owen was born in Shropshire, an English county close to the border with Wales, and came from a lower-middle-class family; Owen attended public schools in Shrewsbury and later became a private tutor, living in France.
When the war broke out, Owen did not join the army immediately—he was not fueled by any particular fervor for war—but he did eventually join up, and he was commissioned in 1915. One particularly grotesque episode in Owen's military life, which saw him trapped in close proximity to a dead fellow officer for several days, resulted in his being diagnosed with "shell shock" (known as PTSD today). Owen very much knew of what he spoke when he wrote of war, unlike his fellow poet Rupert Brooke, to whom he is often compared. His horrific war experiences and subsequent diagnosis of shell shock were vitally important for him as a poet as well as a soldier; Owen was sent to Craiglockhart hospital in Edinburgh, where he met fellow poet Siegfried Sassoon.
Sassoon was a huge influence on Owen's poetry. Drafts still exist of Owen's famous poem "Anthem for Doomed Youth" showing Sassoon's revisions. Owen became passionately devoted to Sassoon. He wrote that he considered Sassoon to be "Keats & Christ & Elijah"—high praise from a young man who had idolized Keats as a poetic model. For this reason, it is very illuminating to compare Sassoon's poetry to Owen's and observe the influences.
When Owen returned to the front line in 1918, he was transformed as a poet, but he was ultimately killed in action late in the year. He received a Military Cross posthumously, and his poems were edited by Siegfried Sassoon to be published after his death. A huge amount of Owen's work, however, was faithfully destroyed by Owen's mother; Owen had given her a sack of early work to be burned upon his death, which she dutifully did.