Phillips-Matz concentrates a great deal of attention on Warren’s performances, career highlights, many warm relationships, and daily life. Warren fell in love with and married American singer Agatha Leifflen, whom he met in Italy. Marriage required that he convert to Roman Catholicism, which he did with the approval of both families. While the marriage brought Warren a life-long supportive, loving relationship, he found himself ostracized by some of the other Jewish artists. Phillips-Matz rounds out her portrait of the man with some of his more temperamental and less attractive qualities. Having worked very hard to train his own voice and refine his roles, he became an unsparing, self-critical perfectionist. He also required the same flawlessness from fellow artists and could be overbearing and intrusive (even to the orchestra) during rehearsals. There are several illustrations of behavior attendant to such peccadilloes that ranged from mild to outrageous. But the heart of this book is Warren’s virtuosity. The details and vignettes recounting Warren’s performances (his conquests and the occasional failure) at the Met, in world opera companies, and on concert tours will fascinate the opera aficionado. The final chapter painfully details the events and circumstances surrounding his onstage death (including some grisly details of the fatal fall), providing sometimes conflicting eyewitness accounts from members of the audience, orchestra, cast, stage crew, and family.