Miller appeared in several notable films, including Squadron Leader X (1943), English Without Tears (1944), The Third Man (1949), The Gamma People (1956), Peeping Tom (1960), ‘’Exodus,’’ 55 Days at Peking (1963), The V.I.P.s (1963), The Pink Panther (1963), and The Yellow Rolls-Royce (1964).

[1][4] The theatrical group of talented Austrian exiles, which included the likes of Lona Cross, Fritz Schrecker and Marianne Walla[3] became known for their sketches and plays which represented a "satirical commentary on Vienna under Nazi rule".

[7] In 1951, Miller appeared alongside Lily Hann, Alan Tilvern, Gabriel Woolf and Alfie Bass in a production of Emanuel Litvinoff's Magnolia Street Story at the Embassy Theatre.

[1] In 1943, Miller was cast as Mr. Krohn in Lance Comfort's World War II spy drama Squadron Leader X alongside Beatrice Varley and Ann Dvorak, his first major film role.

The film, an adaptation of the novel No Nightingales by Caryl Brahms and S. J. Simon, was inspired by the reputation of the property at 50 Berkeley Square as "the most haunted house in London", and co-starred Robert Morley and Felix Aylmer.

[17][18] That year, Miller also portrayed Dr. Hans Tautz in Anthony Kimmins' drama Mine Own Executioner opposite Burgess Meredith, Dulcie Gray and Michael Shepley.

[23] In 1949, he appeared as Tony the café proprietor in Lawrence Huntington's Man on the Run;[24] a customer in Jack Warner's The Huggetts Abroad;[25] Leon Stolz in Arthur Crabtree's Don't Ever Leave Me alongside Petula Clark and Jimmy Hanley;[26] and had uncredited roles as black marketeer Herr Schindler in I Was a Male War Bride and as a headwaiter in the classic film noir The Third Man opposite Orson Welles and Joseph Cotten.

He had an uncredited role in Jay Lewis's comedy The Baby and the Battleship,[38] and played Professor Topolski in Child in the House and Lochner in John Gilling's science fiction picture The Gamma People alongside Paul Douglas, Eva Bartok and Leslie Phillips.

[39] In 1957, he starred in Hugo Fregonese's World War II film Seven Thunders about two British escaped prisoners-of-war, opposite Stephen Boyd, James Robertson Justice and Kathleen Harrison.

The same year, Miller starred in Michael Powell's psychological horror thriller Peeping Tom, playing a doctor who the main protagonist (Karlheinz Böhm), a serial killer who murders women while using a portable movie camera fitted with a spike to record their dying expressions of terror, approaches to cure his scopophilia.

[48] In 1960, Miller also portrayed Stravros in the episode The Lovers of the series Danger Man and Dr. Samuel Odenheim in Otto Preminger's war film Exodus opposite Paul Newman, Eva Marie Saint, Ralph Richardson and Sal Mineo.

[49][50] In 1962, Miller starred as Rossi in the Hammer Film Productions horror The Phantom of the Opera under the directorship of Terence Fisher,[51] and had roles in the TV series Man of the World, Zero One, and Ghost Squad.

The same year, Miller appeared as Dr. Schwutzbacher in Anthony Asquith's The V.I.P.s as Dr. Schwatzbacher opposite Richard Burton, Elizabeth Taylor, Louis Jourdan, Orson Welles and Academy Award for Best Supporting Actress winner Margaret Rutherford.

[61][62] He also portrayed Dr. Zoren in the "Fish on the Hook" episode of Danger Man,[63] and from 1964 onwards, Miller became a regular cast member in ITC productions, albeit with minor roles.