Born and raised in Germany, Arndt received his Bachelor's Degree in Film & Television from Boston University and a Master of Fine Arts in Film Editing from the American Film Institute Conservatory. His work spans over a dozen feature films, including COLD COPY (Bel Powley, Tracee Ellis Ross), IT'S A WONDERFUL KNIFE (Jane Widdop, Justin Long), GONE IN THE NIGHT (Winona Ryder, Dermot Mulroney), and CLEAN (Adrien Brody).

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He is based in Los Angeles, California.