Kinberg made his directorial debut in the 2019 X-Men film Dark Phoenix from a script he also wrote.

[7] While still in film school, Kinberg sold a pitch to Warner Brothers, then went on to write scripts for Disney, Sony, and DreamWorks, working with Steven Spielberg and Jerry Bruckheimer, among others.

His next screenwriting venture was the screenplay for Mr. & Mrs. Smith, directed by Doug Liman and starring Brad Pitt and Angelina Jolie.

Kinberg wrote and produced the movie, which stars Samuel L. Jackson, Hayden Christensen, and Diane Lane.

The following year, Kinberg was writer of Sherlock Holmes, directed by Guy Ritchie, starring Robert Downey Jr. and Jude Law.

[9] A week later the publication stated that Kasdan and Kinberg would be working on future Star Wars projects, but not necessarily on Episodes VIII and IX.

[10] In television, he is an executive producer on ABC network's Designated Survivor starring Kiefer Sutherland, Legion created by Noah Hawley for FX, and The Gifted on Fox.

[11] On November 7, 2024, it was announced that Kinberg has been hired by Lucasfilm to write and co-produce a new trilogy of Star Wars films along with Kathleen Kennedy.