Generate a one-sentence description for each of the following people.
- Brack Obama
- Elon Musk
- Taylor Swift
- Barack Hussein Obama II is an American politician who served as the 44th president of the United States from 2009 to 2017.
- Elon Musk is the founder, CEO, and chief engineer of SpaceX; angel investor, CEO and product architect of Tesla, Inc.; founder of The Boring Company; co-founder of Neuralink and OpenAI; president of the Musk Foundation; and owner and CEO of Twitter, Inc.
- Taylor Alison Swift is an American singer-songwriter.