I went asearching about this. I'm not from the US and basically I'm aware that NASA have a logo.

This: https://www.nasa.gov/audience/forstudents/5-8/features/symbo... seems to be the authorative/PR source and it mentions the creator of the Meatball but not the Worm logo. That's probably a simple oversight but a sad one nonetheless.

FWIW I'm a fan of the worm. The meatball thingie is a bit formulaic for my taste.

EDIT: He also created the logo for this: https://static01.nyt.com/images/2021/02/18/obituaries/18blac...

I think this is nicely apt:

“They say in life there are moments that are once-in-a-lifetime opportunities,” Mr. Blackburn said. “And I got two of them.”