As art director at Universal Pictures for the bulk of the 1930s, Grosz oversaw the company's advertising campaigns and contributed hundreds of his own illustrations.

Beyond the horror genre, his other notable designs include posters for the epic war film All Quiet on the Western Front (1930) and the screwball comedy My Man Godfrey (1936).

The reference website LearnAboutMoviePosters (LAMP) noted that, as of August 2016, Grosz appeared more than any other artist on its comprehensive list of vintage film posters sold for at least $20,000.

[3] In an appendix of the 1988 book Reel Art providing biographical blurbs of poster artists, Grosz's birthplace was given as Hungary but his dates of birth and death were listed as unknown.

[16] Images like Grosz's teaser poster for Frankenstein introduced the general public to the now-familiar characters from Universal's early horror films.

[17] Alongside horror-themed artwork, Grosz's tenure at Universal was distinguished by "lively, dramatic poster work to match the prestige and earnings" of such films as the World War I epic All Quiet on the Western Front (1930) and the early screwball comedy My Man Godfrey (1936).

[23] Following their departures, Universal's poster art of the late 1930s and early 1940s entered a decline marked by a shift from vivid illustrations to mundane photographic reproductions.

[26] Determining the authorship of vintage film posters is intrinsically difficult, however, due to the generally anonymous nature of the work, especially in the United States.

[27] Grosz's window card for Murders in the Rue Morgue is a rare example of an American film poster from the period signed by the artist.

[28] The list below includes films with poster illustrations, ad campaign art direction, or other artwork that has been specifically attributed to Grosz in a secondary source.

[52] According to film historians Stephen Rebello and Richard C. Allen, Grosz's colorful, dramatic illustrations "brought ... a certain charm and almost naive perfection" to "the highly sensationalistic elements of directors Tod Browning's and James Whale's classics—hideous creatures, half-clad heroines, unsealed tombs, mad doctors.

"[53] In their estimation, Grosz's work in the horror genre was equaled only by William Rose's poster art for the 1940s B movies produced by Val Lewton for RKO Pictures, such as Cat People (1942).

[57] Kirk Hammett—the lead guitarist for Metallica and a prolific collector of horror memorabilia—named Grosz his favorite poster artist: His lines are very seductive and there's a glamor and an elegance he manages to capture.

[38]Hammett likened the Frankenstein teaser poster to an "Andy Warhol portrait gone evil" and, "in essence, an amazing example of pop art, 30 years before that term and movement even existed.

[66] He is also the best-represented artist on a much longer list maintained by the website LearnAboutMoviePosters (LAMP), which is periodically updated to include every known sale of a film poster for $20,000 or higher.

[69] While Grosz's name had been largely unknown before The Mummy sale, even among high-end collectors, other examples of his poster art dramatically increased in value shortly afterward.

[63] An original Dracula lithograph set the record again in 2017 with a sales price of $525,800; while the illustrator was unidentified, Grosz was responsible for the art direction of the film's poster campaign as a whole.