Sexton's poetic career was encouraged by her mentor W.D. Snodgrass, whom she met at the Antioch Writer's Conference in 1957. His poem "Heart's Needle" proved inspirational for her in its theme of separation from his three-year-old daughter. Sexton first read the poem at a time when her own young daughter was living with her mother-in-law. She, in turn, wrote "The Double Image", a poem which explores the multi-generational relationship between mother and daughter. Sexton began writing letters to Snodgrass and they became friends.