“A self-declared outsider, the renowned essayist and art critic Harold Rosenberg (1906-1978) rose to prominence in the 20th century to become one of the most essential voices in the discourse of American art. … The author’s ability to decipher the entanglements of a cultural milieu that emerged from this intellectual hotbed is remarkable, and her historical precision alongside some 15 years of research is especially noteworthy. Ms. [Debra Bricker] Balken’s writing is compelling and evenhanded, illuminating some of the last century’s most conspicuous intellectual scuffles, social convolutions, and cultural progress with stunning lucidity. … Often remarking that he got his education on those steps, Rosenberg studied Karl Marx, became a poet, and commenced the study of politics, literature, art, and culture while commingling within the political stew of Marxism, Trotskyism, and Stalinism, among other ideologies. Though he would continue to paint until his 30s, writing became his métier. … This…