He is best known for co-writing episodes of the Fox science fiction supernatural drama series The X-Files with his partner, James Wong.

[1] While attending El Cajon Valley High School, he met James Wong, who would become his friend and professional partner.

[2] Morgan did not want to work in television at first, but wound up accepting a job on 21 Jump Street with James Wong as his writing partner.

[3] As both men were about to leave the company following writing for The Commish in 1992, their former boss at Cannell, Peter Roth, invited them to work on a new show being developed at 20th Television, The X-Files.

[7] In 2010, Morgan served as executive producer on Cartoon Network's Tower Prep alongside Paul Dini.

[14] In 2019, Morgan was executive producer for the Twilight Zone reboot headed up by Jordan Peele and Monkeypaw Productions.