Curtis was born in Rhode Island and educated in Massachusetts along with his older brother James, an influential figure in his life. When Curtis was a teenager, the family moved to New York City where he began a clerkship. Due to his growing interest in the Transcendentalist Movement, Curtis, along with his brother, resided for two years in the utopian community at Brook Farm. William Winter claims that Curtis already had the "Brook Farm ideal" in mind when he arrived there: "the ideal of a social existence regulated by absolute justice and adorned by absolute beauty" (Old Friends 228-30).