The folks at FoundSF/Shaping SF have been scanning neighborhood newspapers here in San Francisco and putting them online at Archive.org. Lisaruth from Shaping SF was nice enough to pass along this 1994 issue of the New Mission News, which included a great article about Scott Williams and his public/exhibited stencil art. Go here for the full article.
An excerpt: Williams's work has a "distinctiveness to it not found in any other work of its kind. It lies in a wildly imaginative juxtaposition of disparate images and traditions that you'd never expect to see in the same space."