Early in his career, he wrote for several series, including the short-lived horror anthology Night Visions and the medical drama Dr. Vegas.
In 2009, Humphrey wrote the feature film "The Code," which was released in the United States under the title "Thick as Thieves".
Also in 2009, he joined the staff of the new legal drama The Good Wife, [3] and would go on to produce 135 episodes of the series, writing or co-writing 19 of them.
Humphrey was executive producer/showrunner of the 2016 Syfy series Incorporated and created the 2017 CBS drama Wisdom of the Crowd.
He then developed for television and serves as Executive Producer and Showrunner of the Netflix series The Lincoln Lawyer, based on the novels by Michael Connelly.