Question: Are Prince and Frederic Zelnik both American actors?

Context articles: The Mill at Sanssouci
Frederic Zelnik
Frederik Fuglsang
Count Varenne's Lover
The Girl from Capri
Prince (musician)
The Forester's Daughter (1931 film)
Dancing Vienna
The Bohemian Dancer (1926 film)
The Blue Danube (1926 film)

The Mill at Sanssouci (German: Die Mühle von Sanssouci) is a 1926 German silent historical film directed by Siegfried Philippi and Frederic Zelnik and starring Otto Gebühr, Lissi Lind and Jakob Tiedtke.
 The film is part of the popular cycle of Prussian films.
 It premiered on 1 February 1926.
Frederic Zelnik (17 May 1885 - 29 November 1950) was one of the most important producers-directors of the German silent cinema.
 He also appeared on screen as an actor.
Frederik Fuglsang (1887–1953) was a Danish cinematographer who worked largely in the German film industry.
 Fuglsang was employed by Nordisk Film, who initially brought him to Germany.
 He worked frequently during the Weimar era on films such as "Vanina" (1922) and Frederic Zelnik's "The Weavers".
 (1927).
 He was married to the actress Käte Fuglsang.
Count Varenne's Lover (German: Die Geliebte des Grafen Varenne) is a 1921 German silent comedy film directed by Frederic Zelnik and starring Lya Mara, Josef Commer and Johannes Riemann.
 It premiered in Berlin on 3 March 1921.
The Girl from Capri (German: Das Mädel von Capri) is a 1924 German silent comedy film directed by Frederic Zelnik and starring Lya Mara, Ulrich Bettac and Robert Scholz.
 It premiered in Berlin on 10 July 1924.
Prince Rogers Nelson (June 7, 1958 – April 21, 2016) was an American singer-songwriter, multi-instrumentalist, and record producer.
 He was a musical innovator who was known for his eclectic work, flamboyant stage presence, extravagant dress and makeup, and wide vocal range.
 His music integrates a wide variety of styles, including funk, rock, R&B, new wave, soul, psychedelia, and pop.
 He has sold over 100 million records worldwide, making him one of the best-selling music artists of all time.
 He won seven Grammy Awards, an American Music Award, a Golden Globe Award, and an Academy Award for the film "Purple Rain".
 He was inducted into the Rock and Roll Hall of Fame in 2004, his first year of eligibility.
The Forester's Daughter (German: Die Försterchristl) is a 1931 German operetta film directed by  Frederic Zelnik and starring  Irene Eisinger, Paul Richter and Oskar Karlweis.
 It is an adaptation of the operetta "Die Försterchristl".
 Zelnik had previously directed a 1926 silent film version "The Bohemian Dancer".
Dancing Vienna (German: Das tanzende Wien) is a 1927 German silent film directed by Frederic Zelnik and starring Lya Mara, Ben Lyon and Alfred Abel.
 The film's art direction was by Andrej Andrejew, Ferdinand Bellan and Erich Kettelhut.
 It was one of several prototypes of the Heimatfilm made by Zelnik in the 1920s.
 The film was intended as a loose sequel to Zelnik's "The Blue Danube" (1926).
The Bohemian Dancer (German: Die Försterchristl) is a 1926 German silent drama film directed by Frederic Zelnik and starring Lya Mara, Harry Liedtke and William Dieterle.
 It premiered in Berlin on 5 March 1926.
 It is based on the operetta 1907 "Die Försterchristl" composed by Georg Jarno with a libretto by Bernhard Buchbinder.
The Blue Danube (German:An der schönen blauen Donau) is a 1926 German silent romance film directed by Frederic Zelnik and starring Harry Liedtke, Lya Mara and Hans Junkermann.
 The film has been described as a paean to Austria.
 The art direction was by Andrej Andrejew and Jacek Rotmil.