Kim attended a puppeteer workshop for Sesame Workshop in 2014 and was hired in 2015 as an assistant puppeteer for Sesame Street starting on season 46. Kim performed the yawning cat seen in the first shot of Episode 4810. She received her first on-screen credit for the series in Season 49.
In addition to performing, Kim is also credited as a consulting producer for the 2021 special, See Us Coming Together.
Kim's other puppetry credits include Martin P. Robinson's musical play All Hallow's Eve, the Fred Rogers biopic A Beautiful Day in the Neighborhood, and as Toeknee the imaginary friend on Awkwafina is Nora from Queens ("Nora Meets Brenda").
- Sesame Street: Muppet Performer (seasons 46 on)
- Once Upon a Sesame Street Christmas: Muppet Performer
- Today (October 21, 2019): Sheinelle Jones Anything Muppet
- See Us Coming Together: Ji-Young
- Kathleen Kim on Instagram (private link)