The Columbia University Mailman School of Public Health has adopted an open access policy.
Here's an excerpt from the announcement:
In accordance with their open access resolution, Mailman School researchers commit to having their published scholarly articles included in Columbia's digital repository, Academic Commons, where content is freely available to the public, or in another repository, such as the National Institutes of Health's PubMed Central, that makes the research publicly available. . . .
The resolution covers all scholarly journal articles as of May 1. There is an opt-out feature built into the resolution, permitting the researcher to request that an article that appears in a journal that insists on exclusivity not have that piece included in the repository.