After starting her career as a teenage program host for an educational video series called Real World Science, she worked as a journalist in New York City and Los Angeles writing for local newspapers and programs as well as numerous fashion and style blogs such as About.com, David's Bridal and Patch.com.

Her major roles include Ritsu Tainaka in K-On!, Suguha Kirigaya/Leafa in Sword Art Online, Sue in Doraemon, Aoi Fukasaku in Coppelion, Kyubey in Puella Magi Madoka Magica, Taiga Aisaka in Toradora and Pelops II in Godzilla Singular Point.

[7][8] She got involved in journalism when she wrote for the local newspaper The Trumbull Times where she covered high school sports.

[12] While in New York, she got involved in voice acting at 4Kids Entertainment and NYAV Post with English parts in anime dubs.

Prior to voicing in anime, she was only aware of a few titles such as Dragon Ball Z which her brother liked, and Sailor Moon which her friends liked.

In 2011 she got a starring role of Ritsu Tainaka, the drummer and outspoken character in the girl band anime K-On!.

[15][16] In the anime film Oblivion Island: Haruka and the Magic Mirror, she voiced Teo, the co-lead to the title character.

[18] Other anime film roles include Akiko in Time of Eve,[19] Noriko in Welcome to the Space Show,[20] and Natsuki in Psychic School Wars.

[29] In the fantasy role-playing video game Bravely Default she plays main party character Edea Lee, who she describes as a "tiny, spunky, badass warrior."

[32] Jason Hidalgo of Reno Gazette-Journal found the English dub to be hit or miss, but "thoroughly enjoyed Edea’s hilarious 'Mrgrgr' commentary.

Morris sought to preserve Lin's characteristics as strong female figure in her portrayal, describing her as "super smart and very self-reliant... She can cook dinner and also kick your ass.

[37] In Omega Strikers, she voices Ai.Mi, a virtual assistant with pink hair and cat ears that "glitched" out of her app and into the real world via a power outage of the central server.

Morris has narrated a number of audiobooks, a few of which have earned her AudioFile magazine's Earphones Awards, the first was for the young adult novel Dear Zoe by Philip Beard in 2004.

[38] Other Earphone Award-winning titles include Salt to the Sea by Ruta Sepetys, Pip Bartlett's Guide to Magical Creatures by Jackson Pearce, and The Tapper Twins Go To War (With Each Other) by Geoff Rodkey.