Gernot created arrangements for the soundtrack album of the motion picture Rounders (1998, score composed by Christopher Young) and has been working as an orchestrator for a variety of Hollywood composers, among them Christopher Lennertz, Henry Jackman, Ramin Djawadi, Christopher Young, Aaron Zigman, Tim Wynn, David Kitay, Todd Cochran and Joe Harnell.

Orchestration credits include the ABC TV series Agent Carter and Galavant (for composer Christopher Lennertz),  as well as the motion pictures Ralph Breaks The Internet, Jack Reacher: Never Go Back and  Big Hero 6 (composer Henry Jackman); ShaftRide Along 2 and Identity Thief (composer Christopher Lennertz); The Uninvited and Spiderman 3 (composer Christopher Young) and Mr. Magorium’s Wonder Emporium (composers Alexandre Desplat/Aaron Zigman).