[3] He started his career as a research assistant and field producer for a number of Bill Moyers documentaries in the late 1990s and early 2000s.

[7] After 9/11, Brangham re-joined Moyers' production company for the PBS newsmagazine Now, where he shot, wrote, and produced dozens of broadcast stories and interviews over a period of six years.

[3] In 2013, Brangham joined the weekend edition of PBS NewsHour in New York City as a producer, correspondent, and occasional substitute anchor.

After two years, he become a correspondent for the PBS NewsHour in Washington, D.C., reporting on general events, conducting studio interviews, and occasionally filling in as anchor of the program.

",[12] of which Brangham was the correspondent, won a News & Documentary Emmy Award in the category "Outstanding Science, Medical and Environmental Report".