His friend Buckminster Fuller had humorously referred to him as a "pink mountain" (rosen berg: German) and "history's most massive reader."
While in his twenties, Rosenberg migrated to New York City and found employment reading plays for a producer on Broadway.
he encountered other photographers and poster artists, among them Henry Koerner, who credited Rosenberg with launching his career in 1945 and transforming his style in 1948–50.
Rosenlaui's proximity to the Reichenbach Falls led Rosenberg to begin his meditations on the fictional detective Sherlock Holmes, resulting in his most popular book.
Published in 1974, this book relates the Sherlock Holmes stories in surprising ways to Nietzsche, Oscar Wilde, Dionysus, Christ, Catullus, John Bunyan, Robert Browning, Boccaccio, Napoleon, Racine, Frankenstein, Flaubert, George Sand, Socrates, Poe, General Charles George Gordon, Melville, Joyce's Ulysses, T. S. Eliot, and many others.
This repetitive narrative sequence reveals to him some deep characteristics of the author Sir Arthur Conan Doyle.