He survived the revolution and found work under the new regime. In 1920, while working for the Petrograd Military District Political Administration (PUR), Tiomkin was one of the lead organizers of two revolutionary mass spectacles, the Mystery of Liberated Labor, a pseudo-religious mystery play for the May Day festivities, and The Storming of the Winter Palace for the celebrations of the third anniversary of the Bolshevik Revolution. He supported himself while living in St. Petersburg by playing piano accompaniment for numerous Russian silent films.

In 1925 the duo received an offer from the New York theatrical producer Morris Gest and emigrated to the US. They performed together on the Keith/Albee and Orpheum vaudeville circuits, in which they accompanied a ballet troupe run by the Austrian ballerina Albertina Rasch. Tiomkin and Rasch’s professional relationship evolved into a personal one, and they married in 1927.

While in New York, Tiomkin gave a recital at Carnegie Hall that featured contemporary music by Maurice Ravel, Alexander Scriabin, Francis Poulenc, and Alexandre Tansman. He and his new wife went on tour to Paris in 1928, where he played the European premiere of American George Gershwin’s Concerto in F at the Paris Opera, with Gershwin in the audience.

After the stock market crash in October 1929 reduced work opportunities in New York, Tiomkin and his wife moved to Hollywood, where she was hired to supervise dance numbers in MGM film musicals. He worked on some minor films, some without being credited under his own name. His first significant film score project was for Paramount’s Alice in Wonderland (1933). Although Tiomkin worked on some smaller film projects, his goal was to become a concert pianist. In 1937 he broke his arm, injuring it so much that he ended that possible career. He began to focus on work as a film music composer.

Beginning with Lost Horizon in 1937, through his retirement from films in 1979, and until modern times, he is recognized as being the only Russian to have become a Hollywood film composer. Other Russian-born composers, such as Irving Berlin, wrote their scores for Broadway plays, many of which were later adapted to film.

During the 1950s Tiomkin was the highest-paid film composer, composing close to a rate of a picture each month, achieving his greatest fame during the 1950s and 1960s. Between 1948 and 1958, his “golden decade,” he composed 57 film scores. In 1952 he composed nine film scores, including High Noon, for which he won two Academy Awards. In the same decade, he won two more Oscars and his film scores were nominated nine times.

Tiomkin had no illusions about his talent and the nature of his film work when compared to the classical composers. “I am no Prokofiev, I am no Tchaikovsky. But what I write is good for what I write for. So please, boys, help me.” Upon receiving his Oscar in 1955 for The High and the Mighty, he became the first composer to publicly list and thank the great European masters, including Beethoven, Strauss, and Brahms, among others.

Tiomkin also made a few cameo appearances on television programs. These include being the mystery challenger on What’s My Line? and an appearance on Jack Benny’s CBS program in December 1961, in which he attempted to help Benny write a song. He also appeared as a contestant on the 20 October 1955 episode of the TV quiz program You Bet Your Life, hosted by Groucho Marx.

He was honored in the Soviet Union and Russia. In 1967, he was a member of the jury of the 5th Moscow International Film Festival. In 2014, his theme songs to It’s a Wonderful Life and Giant were played during the closing ceremony for the 2014 Winter Olympics in Sochi, Russia.

In 1976, RCA Victor released Lost Horizon: The Classic Film Scores of Dimitri Tiomkin (US catalogue #ARL1-1669, UK catalogue #GL 43445) with Charles Gerhardt and the National Philharmonic Orchestra. Featuring highlights from various Tiomkin scores, the album was later reissued by RCA on CD with Dolby Surround Sound.

Dimitri Tiomkin died in London, England in 1979 two weeks after fracturing his pelvis in a fall. He was interred in Forest Lawn Memorial Park Cemetery in Glendale, California.

In 1999, the US Postal Service added his image to their “Legends of American Music” stamp series. The series began with the issuance of one featuring singer Elvis Presley in 1993. Tiomkin’s image was added as part of their “Hollywood Composers” selection.