Redwood Research — Headquarters: San Francisco, CA

Note: The provided excerpt from Redwood Research's website contains information about their research focus areas, highlighted research, and blog posts, but does not include any mention of their headquarters location. While the source URL is from redwoodresearch.org, the actual text excerpt provided does not address the claim about San Francisco, CA being their headquarters. To verify this claim, one would need to check other sections of their website (such as an 'About' page, contact information, or team page) or external sources.